Question

3x-2y= -11 2x+5y=12 matéria

Answer 1

1.
-2y=-11-3x
2y=11+3x
y=11+3x/2
3x-2(11+3x/2)=-11
3x-11-3x=-11
3x-3x=11-11
0=0

2.
2x+5y=12
5y=12-2x
y=12-2x/5
2x+5(12-2x/5)=12
2x+12-2x=12
2x-2x=12-12
0=0