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9x - 4y = 60
9x = 60 + 4y
x = (60 + 4y)/9
selanjutnya di substitusakan ke persamaan ke dua
9x + 4y = - 12
9 ((60 + 4y)/9) + 4y = -12
60 + 4y + 4y = -12
8y = -12 - 60
8y = - 72
y = - 9
9x + 4y = -12
9x + 4(-9) = -12
9x - 36 = -12
9x = -12 + 36
9x = 24
x = 8/3
x = a = 8/3
y = b = -9
a - b = 8/3 - 9 = - 19/3