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(3x + y = -7 )×6
4x - 6y = 20
18 x + 6y = -42
_____________ +
22x = -22
x = -1
substitusikan ke persamaan satu
4x - 6y = 20
4(-1) - 6y = 20
-4 - 6y = 20
-6y = 24
y = -4
3x - y =
3(-1) - (-4)
-3 + 4
1
maka 3x - y = 1