Diketahui sistem persamaan linear : 2x + 3y = 24 x + 4y = 22 Nilai dari 7y -2y adalah

2x + 3y = 24 (dikali 1) => Pers. 1
x + 4y = 22 (dikali 2) => Pers. 2
Maka,
2x + 3y = 24
2x + 8y = 44 -
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-5y = -20
y = -20/-5
y = 4

Jadi,
7y - 2y = 7(4) - 2(4) = 28 - 8 = 20