x - 5y = -37 nya bisa gk dikali 3 ? sy coba dapatnya -13y = -103

3x+2y=8     x1   3x+2y=8
x-5y   =-37  x3   3x-15y=-111
                          ------------------- -
                                 17y=119
                                      y=119/17
                                      y=7

Subtitusikan.

3x+2y=8
= 3x+2.7=8
= 3x+14=8
= 3x=-6
= x=-2

Jadi,6x+4y
       =6.(-2)+4.7
       =-12+28
       =16(c)

3x+2y=8 |x1| 3x+2y = 8
x-5y=-37 |x3| 3x-15y = -111 -
17y = 119
y = 119/17 = 7
-------------------------------------------------
3x+2(7) = 8
3x+14=8
3x=-6
x = -6/3 = -2
-----------++++++

ditanya : 6x + 4y = 6(-2) + 4(7) = -12 + 28 = 16