diket. p dan q memenuhi sistem persamaan linier 7x+2y=19 dan 4x-3y=15. tentukan nilai dari 2p-4q

7x + 2y = 19..... (1)
4x - 3y = 15.......(2)

Eliminasi ke pers (1) dan (2)
7x + 2y = 19 [×3] 21x + 6y = 57
4x - 3y = 15 [×2] 8x - 6y = 30
________________________+
29x = 87
x = 87/29
x = 3

Substitusi x = 3 ke pers (2)
4x - 3y = 15
4(3) - 3y = 15
12 - 3y = 15
-3y = 15-12
-3y = 3
y = 3/-3
y = -1

Nilai 2p-4q = 2(3) - 4(-1)
= 6 + 4
= 10


Semoga membantu.