Solve each system by elimination4x+8y=20-4x+2y=-30

x = 7 and y = −1.

Step-by-step explanation:

4x+8y=20

−4x+2y=−30

Add these equations to eliminate x:

10y=−10

Then solve10y=−10for y:

10y=−10

10y

10

=

−10

10

(Divide both sides by 10)

y=−1

Now that we've found y let's plug it back in to solve for x.

Write down an original equation:

4x+8y=20

Substitute−1foryin4x+8y=20:

4x+(8)(−1)=20

4x−8=20(Simplify both sides of the equation)

4x−8+8=20+8(Add 8 to both sides)

4x=28

4x

4

=

28

4

(Divide both sides by 4)

x=7

Hope this helps!

=)

4400

step-by-step explanation: