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Apabila (x, y) merupakan penyelesaian dari sistem persamaan linear dua variabel 2x + 3y = 5 dan 7x - 4y = 3, tentukan nilai dari 9x - y.
Jawaban ~>
2x + 3y = 5 |×7| 14x + 21y = 35
7x - 4y = 3 |×2| 14x - 8y = 6
29y = 29
y = 1
2x + 3y = 5
2x + 3(1) = 5
2x + 3 = 5
2x = 5 - 3
2x = 2
x = 1
9x - y = 9(1) - 1
= 9 - 1
= 8