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3x+y=-14 (kali 2)
2x-2y=-4 (kali 1)
____________
6x+2y= -28
2x-2y= -4
_______________ +
8x = -32
x. = -4
ambil pers. 1
3x+y= -14
3(-4)+y=-14
-12+y=-14
y= -14+12
y=-2
bukti:
3x+y=-14
3(-4)+(-2)= -14
-12-2=-14
-14=-14
maka nilai 4x-5y= 4(-4)-5(-2) = -16+10= -6 {b}
jadikan yg terbaik? makasih