Jika 3x-y=17 dan x+3y=-1 , maka nilai dari 2x-y=⋯ * ​

Jawaban:

3x – y = 17

x + 3y = -1 → x = -1 – 3y

3(-1 – 3y) – y = 17

-3 – 9y – y = 17

-10y = 20

y = -2

x = -1 – 3(-2)

x = -1 + 6

x = 5

2x – y = 2(5) – (-2) = 12

Hp = {5 , -2}