Question

x-y=-2 2x+y=-1 como resolver?

Answer 1

3×=_3
×=-3/3
×=_1
×_y=_2
-1-y=-2
-y=_2+1
-y=_1 (-1)
y=1

s={-1; 1}

Answer 2

x-y=-2
2x+y=-1

x+2x=-2+(-1)
3x=-2-1
3x=-3
x=-3/3
x=-1

x-y=-2
-y=-2-x
-y=-2-(-1)
-y=-2+1
-y=-1.(-1)
y=1