Mathematics High School

does anyone know how to use substitution for
x+y=21
2x-15=y

Answers

Answer 1

Answer:

Step-by-step explanation:

Replace x

x=-y+21

2(-y+21)-15=y

Then solve the rest

Related Questions

can someone tell me what's happening here? jk don't just help me answer this plzzzzz

7x+4-2x=6(x+1)-x

Answers

Answer:

the sides are not equal

Step-by-step explanation:

7x + 4 - 2x = 6(x + 1) - x     expand

7x + 4 - 2x = 6x + 6 - x      combine similar terms

7x - 6x - 2x + x = 6 - 4

                  0 = 2    ------ no solution

THE FIRST PERSON TO GET IT RIGHT GET BRAINLIEST!!!!!!! Plzzz hurry I need to double check my answers.

Answers

its b because like its -2 to the power of 5 which is 0.04=1/25 i think so lol

Answer:

0.04 or 1/25

Step-by-step explanation:

If x = -2, then the equation is f(-2) = 5^-2

5^-2 is 0.04 so,

f(-2) = 0.04 or 1/25

I hope this helps :)

Solve for y: 6x + 2y = 12

PLEASE SHOW STEPS.
(Brainliest is going to be given once 2 people answer.)
# 12 Points

Answers

solve for y first

2y=12-6×

divide each term by 2 and simplify

y=6-3x

Answer:

y=6-3x

Step-by-step explanation:

6x+2y=12

6x+2y=12 divide all by 2

3x+y=6 subtract 3x from both sides

y=6-3x

What is the compound inequality?

Answers

Answer:

there are only two options?

Step-by-step explanation:

id say b is the answer

Answer:

B

Step-by-step explanation:

Can someone help me with this pls actually be right I need a good grade

Answers

First divide 16 by 12.

That equals 1.333333333

So divide 20 by that number and find what the hypotenuse is which is 15

After that add up all of the numbers so 9+12+15= 36

Final answer 36 inches or C

which statement is true and represent the correct form of scientific notation
A. 5.3 x [tex]10^{-2}[/tex] = -0.053
B. 2 x [tex]10^{4}[/tex] < 20,000
C.-74.308 < -0.74 x [tex]10^{3}[/tex]
D. 12,000,000 = 1.2 x [tex]10^{7}[/tex]

Answers

Step-by-step explanation:

let express them in the same form

5.3*1/100=0.053>-0.053 so A is false

2*10^4=2*10000=20,000 is equal to 20,000 so even B is false

-0.74*10^3=-0.74*1000=-740<-74.308 so even C is false

lets see D

1.2*10^7=12*10^6=12*1000000=12,000,000 which is equal to 12,000,000 so D is true

help me please i need the answer now please help

Answers

Given problem:

What is the value of x = ?

 Solution:

Angle on a straight line is 180°

Sum of angles in a triangle  = 180°

Now to solve the problem, we need to find the two internal angles first;

  For the first one;

      let us say it is y;

              163 + y  = 180

                        y  = 180 - 163 = 17°

    For the second, assume it is z;

            69 + z = 180

                    z = 180 -69  = 111°

The sum of the internal angles of the triangle;

    y + z + 2x   =  180

     17 + 111 + 2x  = 180

                    2x  = 180 - 128

                     2x  = 52

                       x = [tex]\frac{52}{2}[/tex]   = 26

The value of x is 26

a shop is recording the queuing time of its customers and produces the cumulative frequency graph shown below.
a) how many customers queued for more than 20 minutes?
b) Find the median queuing time .

Answers

Answer:

11 customers

11 minutes

Step-by-step explanation:

Answer:

A) 11 Customers

B) 11 Minutes

Step-by-step explanation:

Julissa is running a 10-kilometer race at a constant pace. After running for 18 minutes, she completes 2 kilometers. After running for 54 minutes, she completes 6 kilometers. Her trainer writes an equation letting t, the time in minutes, represent the independent variable and k, the number of kilometers, represent the dependent variable.

Which equation can be used to represent k, the number of kilometers Julissa runs in t minutes?
k – 2 = k minus 2 equals StartFraction 1 Over 9 left-parenthesis t minus 18 right-parenthesis.(t – 18)
k – 18 = k minus 18 equals StartFraction 1 Over 9 left-parenthesis t minus 2 right-parenthesis.(t – 2)
k – 2 = 9(t – 18)
k – 18 = 9(t – 2)

Answers

Answer:

4th option is coreect

Step-by-step explanation:

Answer:

4th answer is correct.!

Step-by-step explanation:

The front of a box and the sticker label on it are similar
rectangles. The front of the box has a width of 9 inches
and a length of 12 inches. Which dimensions could be
the dimensions of the sticker label?

Answers

Answer: 6 in by 8 in

Step-by-step explanation:

hi i need the answer to this

Answers

Answer:

She forgot about the negative sign in front of the 3.7, therefore, she added 3.7 to -3.3 which is equals to 0.4

A submarine that is 245 feet below sea level descends 83 feet and then ascends 103 feet. What is the location of the submarine compared to sea level?​

Answers

The starting number is 245.So it’s already pretty deep in the water,then it goes down 83 feet MORE.so that’s 245+83=328 feet. Then the submarine goes UP 103 feet from that point,so 328-103=225 feet,so its closer to the surface than at the beginning(245ft)

The ratio of juniors to seniors on the track team is 6:7. How many juniors are on the track team if there are 21 seniors on the team?


answer: 18

Answers

Answer:

There are 18 juniors on the track team

Answer:

There are a total of 18 juniors on the track team.

Step-by-step explanation:

Apply the following ratio to the quantity by multiplying.

6:7 = 6 to 7 or 6/7

6/7 × 21 = 126/7 = 18

63.2g of sugar is needed to make 8 cakes how much sugar is needed for 12

Answers

Answer: 94.8

Step-by-step explanation:

To find this, you need half of 63.2 which is 31.6. Then add that to 63.2 and bam, your answer.

Answer:

94.8g of sugar

Step-by-step explanation:

Set up a ratio- [tex]\frac{63.2}{8} =\frac{?}{12}[/tex]

cross multiple- [tex]12*63.2=8*?[/tex]

solve- [tex]758.4 = 8*?[/tex]

divide by 8- [tex]758.4/8 = 94.8[/tex]

EMERGENCY! Please give me the correct answer! ​

Answers

Answer:

The answer is yes!

Step-by-step explanation:

I'm 100% sure, put it into a calculator and it'll give you 1 as the answer.

Answer:

Yes

Step-by-step explanation:

The answer is yes because:

1) As you can see, in standard form the pattern is x * 3 = y

2) If x = 1 it would match the pattern because the next number will be 1 x 3 which is 3, and then the the third number would be 3 x 3 = 9, and then the fourth number would be 9 x 3 = 27 and so on.

Hope this helps! :D

Last year, the school library had a total of x books. Over the summer, the library acquired another 46 books and now had a total of 1,191 books. Which equation could be used to find x, the number of books the library had last year

Answers

Answer:

x is 1,145

Step-by-step explanation:

all you need to do is suntract 1,191 from 46 becase you do not know how many books they started with but you do know how many books they have after and how many books they got over the summer to add

Karen pays $50 to join a health club and $20 each month. So far she has paid the health club $170. Write an equation that could be used to find the number of months, m, that Karen has been a member

Answers

I believe the answer would be Y= 20x +50

Given the expression 2m - 7x + 6 + 3x - 4 what are the CONSTANTS?

Answers

4 and 6 are constants

Answer:

The constants are 6 and 4

Step-by-step explanation:

They don’t have variables next to them

Solve for y: 6(y –1/3 ) = 4(3y – 5).
The solution is y =?

Answers

Answer:

y=3

Step-by-step explanation:

Use the graph shown to complete the following sentence.
when x = 1, then y = ___​

Answers

Answer:

-2

Step-by-step explanation:

On the graph when the X value is equal to 1, the Y value is equal to -2.

The current temperature in Smalltown is 13° F. This is 7 degrees less than twice the temperature that it was six hours ago. What was the temperature in Smalltown six hours ago?​

Answers

Answer:

I Pretty sure it's 3

Step-by-step explanation:

13-7=6

6 divided by 2= 3

Hannah makes $1,500 per month. She spends $450 on groceries and
eating out. What percentage of her budget is spent on food?

Answers

100 dollars I think
Answer: 30%

Explanation

450 divided by 1500 is 0.3

0.3 multiplied by 100 is 30

Answer is 30%

HaEeiiekekekekekek HELP PLEASS

Answers

Answer:

She could arrange the books based on their number. She could start from the smallest number and then move onto the biggest number .  

Step-by-step explanation:

Write each equation in y = mx + b form.


1. x - y = 4







2. 2x + y = 9

Answers

Answer:

1. y=x-4

2. y=-2x+9

Step-by-step explanation:

x-y=4

-x   -x

-y=-x+4

÷-1    ÷-1

y=x-4

2x+y=9

-2x   -2x

y=-2x+9

x - y = 4
-y = -x + 4 (1
y = x - 4


2x + y = 9 (2
y = -2x + 9



If you need the steps explained message me or reply to this comment!!!

Rewrite this phrase using algebraic symbols eight times a number is decreased by 12

Answers

Answer:36

Step-by-step explanation:

Solution for y = 3x -1

Answers

well this is the form for slope so what you would do is graph this and make sure you have a solid line
X= 1/3 or x=3 or x0.3

3 equals what number plus 18?

Answers

Answer:

-21

Step-by-step explanation:

-21+18=3

sometime outiers can have a significant effect on statistics and sometime they don't . Use the following distribution to determine which statistics are affected by outliers. Round to the nearest hundredth.

​

Answers

What is the test name?

A line has a slope of 1/4 and passes through the point (0.2. 4/5).
Find the value of b, the y-intercept.
b=

Answers

Answer:

The value of the y-intercept b is 0.75

Step-by-step explanation:

Here, we want to find the value of the y-intercept

The equation of the line can be written as;

y = mx + b

where m is slope and b is the y-intercept

so y = 1/4x + c

To get the value of b , we substitute for x and y using the given point

4/5 = 1/4(0.2) + c

Multiply

0.8 = (0.25)(0.2) + b

0.8 = 0.05 + b

b = 0.8 - 0.05 = 0.75

Answer:

b=0.75

Step-by-step explanation:

i did it on edge

The amount of Social Security benefits received by an individual that he or she must include in gross income:


a. May not exceed the portion contributed by the employer.

b. May be zero or as much as 85% of the Social Security benefits received, depending upon the taxpayer's Social Security benefits and other income.

c. May not exceed 50% of the Social Security benefits received.

d. Is computed in the same manner as an annuity [exclusion = (cost/expected return) × amount received].

e. None of these choices are correct.

Answers

Answer:

b. May be zero or as much as 85% of the Social Security benefits received, depending upon the taxpayer's Social Security benefits and other income.

Step-by-step explanation:

Social security measures an organization to guarantee individuals against certain risks (social risks). Social security is made up of a set of institutions whose function is to protect individuals from the consequences of various events or situations, generally referred to as social risks.

Social Security is a public service of the State, ensuring all the social risks of workers, employees, liberal professions, self-employed, and non-salaried workers. Social Security provides the benefits provided by the Social Security Code. However, the amount of Social Security benefits received by an individual that they must include in gross income may be zero or as much as 85% of the Social Security benefits received, depending upon the taxpayer's Social Security benefits and other income.

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