5x-2y=21 dab -x+2y=-9 menggunaan metode eliminasi

Jawab =
Metode Eliminasi
5x-2y = 21
-x +2y = -9
—————– +
4x = 12
x = 12÷4
x = 3

y?
5x-2y = 21 (×1)
-x+2y = -9 (×5)
menjadi,
5x-2y = 21
-5x+10y = -45
——————– +
8y = -24
y = -24÷8
y = -3

maka,
Hp :{3,-3}