Answer:
x=-1, y=1
( -1,1)
Step-by-step explanation:
Lets solve these by elimination. We will add the two equations together and eliminate y
x+y=0
x-y+2=0
------------------
2x +2 = 0
Subtract 2 from each side.
2x+2 -2 =0-2
2x = -2
Divide by 2 on each side to get x alone.
2x/2 = -2/2
x = -1
Now that we have x, we need to solve for y
x+ y =0
Substitute x back into the equation.
-1 + y = 0
Add 1 to each side
-1+1 +y = 0 + 1
y =1
( -1,1)
