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2 years ago

If 2x + y = -8 and -4x + 2y = -16, what is the value of y?

Mathematics

1 answer:

Dima020 [189]2 years ago

3 0

Answer:

y = -8

Step-by-step explanation:

Solve as a system of equations

2x + y = -8 multiply this equation by 2

-4x + 2y = -16 Do not change

Solving: 4x + 2y = -16

4y = -32

y = -8

2x + y = -8 Solve for x

2x = -y - 8

x = -y/2 - 8/2

x = -1/2y - 4 Substitute this into your second equation

-4x + 2y = -16

-4(-1/2y - 4) + 2y = -16

2y -16 +2y = -16

4y - 16 = -16

4y = -32

y = -8 x = -1/2(-8) -4 = 4 - 4 = 0

Checking the answer

2(0) + -8 = -8

-4(0) +2(-8) = -1 6 = 0 -16 = -16

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If (a+10) and (a+20)are supplementary angles,find them

motikmotik

Given:

(a+10) and (a+20) are supplementary

To find:

Each angle

Steps:

if 2 angles are supplementary that means they add up to 180°

(a + 10) + (a + 20) = 180

a + 10 + a + 20 = 180

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2a = 180 - 30

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Happy to help :)

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