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Persamaan pertama (kali 12)
9x - 4y = 60
Persamaan kedua (kali 6)
3x + 4y = -12
Gunakan metode eliminasi
9x - 4y = 60
9x + 12y = -36
-16 y = 96
y = -6
Masukan ke persamaan (yang mana saja)
3x -72 = -36
3x = 36
x = 12
maka x-3y adalah 12 - 3(-6) = 12 + 18 = 30