Jika x dan y memenuhi sistem persamaan linear 5x + 3y = -1 dan 6x + 2y = 2, maka nilai 5x – 2y
5x + 3y = -1
6x + 2y = 2
Eliminasi variabel y untuk menentukan nilai x
5x + 3y = -1 (×2)
6x + 2y = 2 (×3)
10x + 6y = -2
18x + 6y = 6
__________ –
-8x = -8
x = 1
Substitusi x = 1 ke 5x + 3y = -1
5x + 3y = -1
5(1) + 3y = -1
5 + 3y = -1
3y = -1 – 5
3y = -6
y = -2
5x – 2y = 5(1) – 2(-2)
= 5 + 4
= 9
Semoga membantu.