Diketahui 3x + y =-2 -2x+3y =5 nilai x-y adalah

3x+y = -2 ×2 6x+2y = -4
-2x+3y = 5 ×3 -6x+9y = 15
—————— ——————– +
11y = 11
y = 1
3x+y = -2
3x+1 = -2
3x = -3
x = -1

x-y = -1-1 = -2