3x + 2y = 8 dan 5x + y = 11 tentukan dengan cara substitusi

3x + 2y = 8

5x + y = 11
y = 11 – 5x

3x + 2y = 8
3x + 2(11-5x) = 8
3x + 22 – 10x = 8
– 7x = 8-22 = -14
x = 14/7 = 2

y = 11 – 5x
y = 11 – 5(2)
y = 11 – 10
y = 1