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x-y=3
-y=3-x
y=-3+x
2x+(-3+x)=3
2x-3+x=3
3x+6
x=2
y=-3+2=-1
x - y = 3, x = 3 + y, masukkan kepersamaan satu
2(3+y) + y = 3
6+2y + y = 3
3y = 3 - 6
y = -3 : 3
y= -1
X - Y = 3, masukkan nilai y = -1, maka :
x -(-1) = 3
x + 1 = 3
x = 3 -1
x = 2