Mathematics High School

Use substitution to solve the system.
x = 3y +7
3x + 4y = 8

Answers

Answer 1

Answer:

x=4, y=-1

Step-by-step explanation:

x=3y +7. equation 1

3x+4y=8. equation 2

substitute equation 1 into equation 2

3 (3y +7)+4y =8

9y+21+4y=8

13y+ 21=8

13y=8-21

y=-13/13

y=-1

substitute the value of y into equation 1

x=3(-1)+7

x=-3+7

x=4

Related Questions

Which inequality represents this situation?
Players must practice at least 45 minutes a day.

t 45
t ≥ 45

Answers

Answer:

t≥45

Step-by-step explanation:

If it says at least, it means fine must be greater than or equal to 45.

Helpppp I’ll mark brainliest

Answers

X is 5
Y is 25 and then you just multiply by 3 each time

Question 10 of 10
Solve 3 ax + 4ax = 5ax + 4 for x. Assume at 0.
A. X = 2
a
B. x= 2a
C. x =
За
D. X = 3a

Answers

[tex]x = \frac{2}{a} [/tex]

Step-by-step explanation:

3 ax + 4ax = 5ax + 4, combine like terms

7ax = 5ax + 4, minus 5ax from both sides

2ax = 4, divide 2a on both sides

you'll be left with x = 2/a

You are going down the river at 2mph but your canoe loses a wheel. at this rate, how many boxes of pancake mix will it take to re-shingle your roof.

Answers

Answer:

The temperature of the sun is -498 K / meters square

Hope that helps!

Answer:

Um... Is this the real question or you just trolling???

Step-by-step explanation:

Stock A changed by - $2,60 during the day. Stock B changed by 3
times that amount. How much did Stock B change during the day?

Answers

Answer:

$7.80

Step-by-step explanation:

$2.60 * 3 = $7.80

Refer to the graph. Find the slope of each line

Answers

the top line has a slope of 2/4 which reduces to 1/2 and the second line has a slope of -1/4

Answer:

The top line has a slope of 1/2

The bottom line has a slope of - 1/4

What’s mean by report this answer

Answers

Answer:

Like make it bad.Its offensive

Step-by-step explanation:

can i get some help plz with this

Answers

Answer:

translation then reflection is the answer

Step-by-step explanation:

help will give crown only REAL ANSWERS COMMENT IF YOU HAVE A QUESTION

Answers

Answer:

A

Step-by-step explanation:

In that example the plane is going up constantly whereas in example B the plane in going down, in example C the plane it going up but the stops and goes at the same speed, and in D the plane it once again going down.

what number can be added to 55 and have 45 and 9 as thier greatest common factor?

Answers

Answer:

36

Step-by-step explanation:

what is the squared root of 64?

Answers

Answer:

8

Step-by-step explanation:

Answer:

the square root is 8

Step-by-step explanation:

Write an equation of the line in standard form with integer coefficients. the line through (-2, 2), (1, -4). O A. y+2x=-2 B. y+2x=6 C. 2y+x=2 D. 2y+x=-6 ​

Answers

Answer:

A

Step-by-step explanation:

K=(y1-y2)/(x1-x2)=(2+4)/(-2-1)=-2

y=-2x+b

2=-2*-2+b

b=-2

y=-2x-2

y+2x=-2

The equation of the line in standard form with integer coefficients is → y + 2x = - 2.

What is the general equation of straight line?

The general equation of straight line is -

y = mx + c          

where 'm' represents the slope of the line and 'c' is the y - intercept.

Given is a line that passes through the points -

(-2, 2), (1, -4)

We can calculate the slope of the line using the two coordinates given -

(-2, 2), (1, -4). The slope will be -

m = (- 4 - 2)/(1 + 2)

m = -6/3

m = - 2

Assume that the equation of line is -

y = -2x + c

The line passes through the point (-2, 2), so we can write -

2 = -2 x -2 + c

2 = 4 + c

c = -2

So, we can write the equation of line as -

y = - 2x - 2

or

y + 2x = - 2

Therefore, the equation of the line in standard form with integer coefficients is → y + 2x = - 2.

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how do I solve for x?

Answers

Answer:

85

Step-by-step explanation:

The sum of the measures of the interior angles of a triangle is 180 deg.

x + 52 + 43 = 180

x + 95 = 180

x = 85

Answer: 85

The angles in a triangle add up to 180 degrees

180 - 52 - 43 = 85

x = 85 degrees

A librarian wants to spend no more than $800 on some new desks and chairs for the library. The librarian decides to spend $320 on desks.

If each chair costs $24, what is the maximum number of chairs the librarian can buy for the library and stay within the budget?

Answers

Answer:

I think 20

Step-by-step explanation:

480/24

The maximum number of chairs that the librarian can buy is 20

What are mathematics operations?

A mathematical operation is a function that converts a set of zero or more input values (also called "b" or "arguments") into a defined output value. The number of operands determines the operation's arity. Most commonly studied operations are binary operations (i.e., operations of arity 2), such as addition and multiplication, and unary operations (i.e., operations of arity 1), such as additive and multiplicative inverses.

• Zero-arity operations, or nullary operations, are constants, and mixed products are arity three operations, or ternary operations.

Since we are given the amount total budget and the total amount for the desks then the only variable missing is the maximum amount of chairs. This can be solved with the following equation in which :

s represents = the number of chairs,

and we simply solve for s.

800 = 320 + 24s  ... subtract both sides by 300

500 = 24s ... divide both sides by 24

20.83 = s

Now we see that the maximum number of chairs that the librarian can buy is 20 because 21 would make her go over the budget and you cannot have 0.83 of a chair.

Read more about mathematics operations at:

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846 x (84) what is it?

Answers

If it’s simple multiplication, the answer should be 71,064. It can be solved by hand or by calculator

HELPPPP!!!
The LCM of 50, 120, and 225 is 5.


True or False

Answers

False, the LCM of 50, 120 and 225 is 1800.

5 is the GCF of 50 120 and 225, not the LCM.

Hope it helps!

Answer:

The answer is False

Step-by-step explanation:

5 is the smallest number that can fit into all 3 numbers.

BRAINLIST!!!!! Do you know the sample response?!

Answers

Answer:

The graph and equation both match and are a function. there is one specific output fro each input

Step-by-step explanation:

Do numbers with exponents represent rational or irrational numbers? Explain your answer.

Answers

9514 1404 393

Answer:

  either

Step-by-step explanation:

They could represent either:

  2^2 = 4 . . . a rational number

  2^(1/2) = √2 . . . an irrational number

The fact that a number has an exponent does not make it either rational or irrational.

__

Additional comment

You can also consider irrational numbers with exponents.

  (∛2)^2 = 2^(2/3) . . . irrational

  (√2)^2 = 2^1 . . . . . . rational

Find the 62nd term of the arithmetic sequence -27, -21, -15

Answers

it’s 339 if u keep adding 6 until the 62th term

The 62nd term of the arithmetic sequence -27, -21, -15 is 339

Arithmetic sequence

The nth term of an arithmetic sequence is expressed as:

Tn =a+(n-1)d

Given the sequence -27, -21, -15

a is the first term = -27

d is the common difference = -21 + 27 = 6
n = 62

Substitute

T62 = -27 + (62-1)(6)
T62 = -27 + 61(6)

T62 = -27 + 366
T62 = 339

Hence  the 62nd term of the arithmetic sequence -27, -21, -15 is 339

Learn more on sequence here: https://brainly.com/question/6561461

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whats the answer to number 5 please and thank you? please write down the steps

please help

Answers

Answer:

67

Step-by-step explanation:

Answer:

35

Step-by-step explanation:

x + 55 = 90 (Right angle triangle)

x = 90 - 55

x = 35

Please mark as brainliest.

Prove that:

( sec 4A - 1 ) / ( sec 2A - 1 )

=

tan 4A . cot A

Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help Pls Help

Answers

GangbbsnnanMmajajajnqj

Answer:

sec 1A = tan 2A

Step-by-step explanation:

BABAOEY

7/8 of Bill's coins are. pennies.
What % are pennies?

Answers

Answer:

87.5% are pennies

Step-by-step explanation:

7/8 = 87.5%

Hope this helps!!

Help me solve this problem please

Answers

A Line 2 the 10 is supposed to be positive

PLEASE FAST HELP PLS I BEG U

Answers

Answer:A.,C.,D that is the answer

Step-by-step explanation:

Ooh ig oh oh oh oh oh

7a-3(2a-4) what’s the answer?

Answers

Answer:

?

Step-by-step explanation:

Answer:

a+12

Step-by-step explanation:

Distribute the -3 to (2a-4) so you get -6a+12

then it is 7a-6a+12, which is a+12.

If you need an actual number then a+12=0 is a=-12, if you just needed to simplify it, then a+12

A. it has no rotational symmetry
B. It has rotational symmetry with an angle of rotation of 180°
C. It has point symmetry
D It has recreational symmetry
PLEASE HELP WILL MARK BAINLIST​

Answers

The answer to the question is C.
Answer is C it has point symmetry

What is the least common facter of 9 and 12?

Answers

Answer:

3

Step-by-step explanation:

You need to know the least common denominator (LCD) of 9 and 12 if you want to add or subtract two fractions with 9 and 12 as denominators. The least common denominator, also called lowest common denominator (LCD), of 9 and 12 is 36.

75 is what percent of 150?

If you show work you will be marked brainliest

Answers

50%

You need to convert the fraction (ratio)

Afterwards, you will get your answer!

I don't know how to upload or I would upload a picture of my work and how to do it to help you.

I hope this helps you!

Answer:

50percent

Step-by-step explanation:

75 is half of 150

I need HELP ASAP RIGHT AWAY​

Answers

Answer:

line c and e

Step-by-step explanation:

YOO HELPP

I’m bad at math

Answers

Answer:

i love you

Step-by-step explanation:

Answer:

1/2(n-3) or (n-3)/2

Step-by-step explanation:

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