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y = - 2x + 12
Dengan cara substitusi untuk y = - 2x + 12 ke pers 1, kita peroleh
3x - 5y = 31
3x - 5(-2x + 12) = 31
3x + 10x - 60 = 31
13x = 31 + 60
13x = 91
x = 91/13 = 7
Maka
y = - 2x + 12
y = - 2(7) + 12 = - 14 + 12 = - 2
Maka (x, y) = (7, - 2)