Jika diketahui 3x+y= -2 dan -2x+3y=5 maka nilai x-y adalah... a. 2 b. -1 c. 0 d. 1

3x   + y = -2
-2x + 3y = 5
_________ -

9x  + 3y = -6
-2x + 3y = 5
_________ -

11 x = -11
x = -1

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

x - y
-1 - 1
-2