Question

Solve using substitution-2x-y=-9. 5x-2y=18

Answer 1

Equation 1)  -2x-y=-9
Equation 2)  5x-2y=18

Multiply all of equation 1 by 2, so that both equations have (2y) in them.

1)  2(-2x-y=-9)

Simplify.

1)  -4x-2y=-18
2)  5x-2y=18

Subtract equations with each other.

-9x=-36

Divide both sides by -9.

x=4

Plug in 4 for (x) into equation 1.

-2x-y=-9

-2(4)-y=-9

Simplify.

-8-y=-9

Add 8 to both sides.

-y=-1

Divide both sides by -1.

y=1

(4, 1)

~Hope I helped!~