Question

Dik : sistem persamaan linear 3x+y=-10 dan 2x+3y=-16. nilai 3x-2y adalah?

Answer 1

3x +y = -10 (dikali3)
2x +3y = -16

dieleminasikan
9x + 3y = -30
2x + 3y = -16
______________-
7x = -14
x = -2

2x + 3y =-16
2(-2) + 3y = -16
3y = -16+4
y = -4



maka nilai dari 3x -2y = 3(-2) -2(-4)
=-6+8 =2