−3x − 8y = 20 −5x + y = 19 solved by substitution

Answers

Answer 1

Delete as this is the wrong answer. Made a typo in the answer.

Answer:

x = [tex]\frac{-212}{3}[/tex]

y = 24

Step-by-step explanation:

-3x - 8y = 20  .... (1)

-5x + y = 19   .... (2)

What we can do is take the (2) equation

-5x + y = 19

and solve for y by adding 5x to both sides

y = 24

now that we have y we substitute it in for y in equation (1)

-3x - 8(24) = 20

-3x - 192 = 20

we want to solve for x so we need to get its self.

add 192 to both sides

-3x = 212

now we divide both sides by -3. It's going to be a fraction.

x = [tex]\frac{-212}{3}[/tex]

Answer 2

Answer:

x=-4

y=-1

Step-by-step explanation:

-3x-8y=20

-5x+y=19

rewrite for y:

y=19+5x

substitute y

-3x-8(19+5x)=20

-3x-152-40x=20

-3x-152-40x+152=20+152

-43x=172

-43x/-43=172/-43

x=-4

substitute x

-5(-4)+y=19

20+y=19

y=-1

check:

-3(-4)-8(-1)=20

12+8=20

-5(-4)+-1=19

20-1=19


Related Questions

Jose rents a bike for $4 plus $2.50 per hour. ELaine rents a moped for $10 plus $1 per hour write and solve the system of equation to determine at what point they spend the same amount

I need an answer quick

Answers

Answer:

Jose: Y= 2.50x +4

Elaine Y= 1x +10

same at 4

Step-by-step explanation:

at which week will keith and greg have downloaded the same number of songs?

Answers

Answer:

Week 15

Step-by-step explanation:

Find the equations to the sequences and solve as equation

5n+20 = 2n+50

5n= 2n +30

3n=30

n=15

If a prism has the triangular base shown and a height of 3", then its volume is 384 cubic inches.

True
False

Answers

Answer false :))))))))

please be kind enough to help me with this question in my geometry test thank you i’m very grateful

Answers

Answer:

yes

Step-by-step explanation:

Is the relation a function?

(5,4),(3,10),(1,16),(3,8),(−1,6)
YES or NO?

Answers

Answer:

No.

Step-by-step explanation:

The input 3 is used twice. In order to be a function, an input must only go to one output.

sarah used 2.5 cups of cheese in a dish that serves 10 people amyn used 1.6 cups of cheese in a dish that serves 8 people how much more cheese is in one serving of sarahs dish

Answers

Answer:

[tex]\frac{1}{20}[/tex] more cheese in Sarah's dish than Amyn.

Step-by-step explanation:

To find this, we need to get the two fractions, [tex]\frac{2.5}{10}[/tex] and [tex]\frac{1.6}{8}[/tex] to a common denominator. The closest one is a multiple of 4 for [tex]\frac{2.5}{10}[/tex] and a multiple of 5 for [tex]\frac{1.6}{8}[/tex] .

This makes both fractions much more comparable, and we have

[tex]\frac{10}{40}[/tex]  for Sarah's dish

[tex]\frac{8}{40}[/tex] for Amyn's dish.

Knowing Sarah has [tex]\frac{2}{40}[/tex]'s more cheese in her dish, we can still simplify, so after dividing 40 by 2, we get [tex]\frac{1}{20}[/tex], the simplest form of how much more cheese Sarah has in her dish than Amyn,

Please help asap!!!!!!!! Number 2 and 3

Answers

Answer:

Step-by-step explanation:

2)  r = 16/2 = 8 cm

Area of top and bottom = 2*πr²

                                        = 2 * 3.14 * 8 * 8

                                       = 401.92 cm²

Midlle part = h * πd

                 = 6 * 3.14 * 16

                = 301.44 cm²

Total = 401.92 + 301.44

        =        703.36 cm²

3) Area of front and back = [tex]2* \frac{1}{2}*b * h\\[/tex]

                                         [tex]= 2*\frac{1}{2} * 3 * 4\\\\= 12 cm^{2}[/tex]

Area of bottom = length * breadth

                           = 12* 3

                          = 36 cm²

Area of left =  12 * 4

                  = 48 cm²

Area of right = 12 * 5 = 60 cm²

Total = 12 + 36 + 48 + 60 = 156cm²

HELP ME CHEAT

A small pouch contains 8 black marbles, 5 white marbles, and 12 red marbles.


Find the probability of picking a red then a black marble if you do not replace the first marble.



0.16



0.32



0.3



0.5

Answers

The answer would be 0.3

The sum of two numbers is 18. The difference between the two numbers
is 12. What is the two numbers?

Answers

the answer is 6 and 6

For the question, calculate the slope of a line that passes through the points given. Remember to reduce all fractions to lowest terms.

(-14, 18), (-16, 14)

Answers

Answer:

the answer is 2 or 2/1 hope this helps

Answer:

In fraction form, the slope is 2/1.

Or, the slope is just 2.

Step-by-step explanation:

Using the equation:

m =  

y2 - y1  /

x2 - x1

Plug in the x and y points and solve.

note: m = slope in slope intercept form, y - mx + b

y2 = 14     y1 = 18

x2 = -16     x1 = -14

14 - 18 / -16 -(-14)

-4 / -2

Simplified: -2 / -1

In fraction form, the slope is -2 / -1, or 2/1 because either way works.

Or, the slope is just 2.

Hope this helps! If you have any additional questions, please don't hesitate to ask me or your teacher to be sure you master the subject. Stay safe, and please mark brainliest! :)

Can someone please help me. WILL MARK YOU BRAINLIEST!!

Answers

Answer:

A. y > -3 All real numbers greater than -3

Step-by-step explanation:

HELP PLEASE HURRY... 65 POINTS

Answers

Answer:

A

Step-by-step explanation: The slope is positive, the y intercept is on the y axis.

(someone help)

Andre is running in an 80-meter hurdle race. There are 8 equally-spaced hurdles on the race track. The first hurdle is 12 meters from the start line and the last hurdle is 15.5 meters from the finish line. How far are the hurdles from one another?

Answers

Answer:

600 and 3

Step-by-step explanation:

Mr. Gardner is making 6 treat bags. He has 185 chocolate-covered raisins to share evenly among the treat bags.
How many chocolate-covered raisins will be in each treat bag?
How many chocolate-covered raisins will be left over?

Answers

Answer:

30 chocolate covered rasins

5 left over

Step-by-step explanation:

Step 1: 185 Divided by 6 and that gets you 30, and some left over.

Step 2: Do 6 x 30 and that gets 180

Step 3: Do 185 subtract 180 and then you get 5

Step 4: So 30 chocolate coverd raisins will go in each bag, and 5 will be left over.

Have a great day, Lord Bless :)

If a spider can move ¼ of a mile every hour, then how many hours would it take for a spider to go 6 miles?

Answers

Answer:

6/4 = 3/2

Step-by-step explanation:

multiply 1/4 by 6

PLS HELPPPP GRADES DUE!

Answers

Answer:

Step-by-step explanation:

Starting with ΔABC, draw the dilation image of the triangle with a center at the origin and a scale factor of two. Notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). Dilations involve multiplication! Dilation with scale factor 2, multiply by 2

Answer:

Yea wut she said ._. above me...

Step-by-step explanation:

the quotient of four and e

Answers

Answer:

1.4 i think

Step-by-step explanation:

Can somebody answer these please!!
Ill Mark Brainliest^^

Answers

Answer:

1. -5

2. 0.5

3. -4

4. 8

5. 9

6. -3

7. 5

8. 0.6

9. -7

10. 10

11. -5

12. 4

13. -9

14. 4

15. -6

Step-by-step explanation:

It's just the number that doesn't have a x to the side on it

Answer:

(0,-5)

(0,0.50)

Step-by-step explanation:

just put the number that doesn't have x with it in the answer spot but don't forget to do the (0,#) it's important that you do it like that so for example the problem y=4x-3 you would just put in the answer column (0,-3)


To go to the park, It costs $4 plus $3 per child. Which equation shows this situation
where x represents the number of children

Answers

Answer:

y = 3x + 4

Step-by-step explanation:

Because $4 is your base pay, it is your y-intercept. And because it is $3 per child, then that is your slope. "x" represents how many objects/people/etc. there could be.

Dan has 108 muffins, which he needs to box up, 6 of which are blueberry, into dozens. How many boxes does he need?

Answers

Answer:

9 Boxes

Step-by-step explanation:

Take 108 and divide by 12

find lowest common denominator write the equivalent fractions 2/5 and 1/10

Answers

Answer: 4/10 = look below for explanation

Step-by-step explanation:

Transform 2/5 into the same demononator

= 2/5 becomes 4/10 because you've multiplied 2x2 and 5x2

which becomes 4/10 and 1/10

to solve: 4/10 - 1/10 = 3/10

25+8x=5+12x whats the answer?

Answers

Answer:

x = 5 (see below)

Step-by-step explanation:

Combine like terms by subtracting on both sides:

25 + 8x = 5 + 12x

20 = 4x

Then divide:

20 = 4x

5 = x

Move the variable to the left side of the equation:

x = 5

The answer would be x=5
Hopefully this helps

4x^2-36 correct factorization

Answers

Answer:

4 (x + 3) (x - 3)

Step-by-step explanation:

Jessica school bus stop is 60 yards from her house.For a normal school week, how many feet will Jessica walk to and from the bus stop?

A 300 feet

B 600 feet

C 900 feet

D 1,800 feet

winner gets 100 points

Answers

Answer:

d

Step-by-step explanation:

school is only 5 days a week and if she walks 60 yards to the bus stop and 60 yards back from the bus stop than she walks a total of 120 yards a day

120 x 5 =600 the answers are in feet so we need to convert to feet and to do that we need to multiply by 3

600x3=1800

so she walks 1800 feet in a normal school week

Answer:

Step-by-step explanation:

I need the answer to number 6

Answers

Answer:

121

Step-by-step explanation:

All of the sides should add up to 900. 121 does that

The average distance from the Sun to Mars is 22,793, 910,000,000 centimeters.

The conversion factors between centimeters and four other units of measure are shown below.

9.46. 10^17 cm = 1 light-year
1.50.10^13 cm = 1 astronomical
1 . 10^5 cm = 1 kilometer
1. 10^2 = 1 meter

For the distance to be expressed as x units of measure, where 1 < x < 10, which unit of measure must be used?

A Light-years
B) Astronomical units
C)Kilometers
D) Meters​

Answers

Step-by-step explanation:

JOIN MY MEETING

ID-9384026088

PASSWORD 1234

Answer:

C

Step-by-step explanation:

Convert the following mixed number into a improper fraction.5 1/2​

Answers

the answer is 11/2 ur welcome

Answer:

Step-by-step explanation:

[tex]\text{rule}=a+\frac{b}{c}=\frac{ac+b}{c}\\ \\ 5\frac{1}{2}=\frac{5(2)+1}{2}\\ \\ \frac{11}{2}[/tex]

What is the missing number?
URGENT PLS HELPP

Answers

Answer:

1723

Step-by-step explanation:

answer my last question plz

What is 75 times 4 does anyone know if they do I need a asnwer asap Please and Thank you

Answers

Answer:

75 x 4 = 300

Step-by-step explanation:

Ummmm multiplication

The answer to your question is 300

Does anyone know the answer to this!?!?

Answers

Answer:

option B is correct answer

the answer is b u had it right
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