Question

Solve the following system of linear equations algebraically
-2x+y=2
x+y=-1

Answer 1

x=-1-y
In equation -2x+y=2 substitute x=-1-y

-2*(-1-y)+y=2
2+2y+y=2+2+3y=2
3y=0
y=0

go to x=-1-y and substitute y=0. Then you get x=-1