diketahui {3x + y = -2 {-2x + 3y = 5 nilai x - y adalah..... A.-2 B.-1 C.0 D.1

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

eliminasi
9x + 3y = -6
-2x + 3y = 5
------------------ (-)
11x = -11
x = -1

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

jadi
x - y
= -1 - 1
= -2