Question

Diketahui sistem persamaan:3x+2y=-2 dan 5x-y=14.Nilai dari 2x+4y..

Answer 1

3x + 2y = -2
5x - y = 14 
>>>>>>>>>>>> x1 dan x2 [eliminasi]
3x + 2y = -2
10x - 2y = 28
---------------------------- [ + ]
13 x = 26
x = 2

5x - y = 14
5.[2] -y = 14
10 - y = 14
-y = 14 - 10
-y = 4
y = -4

2x + 4y =
2.[2] + 4.[-4]
4 + -16 = -12