tolong caranya gimana

cara= eliminasi
3x+y=-2 |x3
-2x+3y=5 |x1
________
9x+3y=-6
-2x+3y=5
________-
11x=-11
x=-1

3.-1+y=-2
y=-2+3
Y=1

Nilai x-y=-1-1=-2 (a)
semoga membantu