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2x - 5y = 9
dengan menggunakan substitusi
2x - 5y = 9
2 (5 + 3y) -5y = 9
10 + 6y - 5y = 9
y = 9 - 10
y = -1
substitusi y = -1 ke persamaan
x = 5 + 3y
x = 5 + 3 (-1)
x = 2
nilai dari 3x + 2y
= 3 (2) + 2 (-1)
= 6 - 2
= 4