Question

y=2x+7

3x-y=-9

Solve each system of equation by the substitution method.

Answer 1

plug in the first equation into the he second equation

3x-(2x+7)=-9
3x-2x-7=-9
x-7=-9
x=-2

plug in x=-2 into the first equation

y=2(-2)+7
y=-4+7
y=3

answer: (-2,3)