diketahui {3x+y= -2 {-2x +3y= 5 nilai x-y adalah..

3x + y = - 2 |×3
- 2x + 3y = 5
maka
9x + 3y = - 6
- 2x + 3y = 5
-------------------(-)
11x = - 11
x = - 1
substitusi
3x + y = - 2
3(-1) + y = - 2
- 3 + y = - 2
y = - 2 + 3
y = 1
hp = ( - 1 , 1 )