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5x - 3y = 28 | ×1 | 5x - 3y = 28
2x + y = 9 | ×3 | 6x + 3y = 27
____________ +
11x = 55
x = 55 ÷ 11
= 5
x = 5 disubstitusikan ke 5x - 3y = 28 atau 2x + y = 9
jika
2x + y = 9
2(5) + y = 9
10 + y = 9
y = 9 - 10
= -1
jadi 3x - 4y
⇔ 3(5) - 4(-1)
⇔ 15 + 4
⇔ 19