Answer:
x = -1
y= -2
Step-by-step explanation:
-x + y = -1
2x - y = 0
Add the two equations together to eliminate y
-x + y = -1
2x - y = 0
--------------------
x +0y = -1
x = -1
Now find y
-x+y = -1
-(-1) + y = -1
1+y = -1
Subtract 1 from each side
y = -1-1
y = -2
