Jawapan

2016-08-17T15:07:41+08:00
=6x-18y-12x+20y
=6x-12x-18y+20y
=-6x-20y
2016-08-17T19:10:18+08:00
6(x-3y) - 4(3x-5y)
= (6x-12y) - (12x-20y)
= 6x - 12y -12x + 20y
= -6x + 8y
= 8y - 6x
pembetulan:
6(x-3y) - 4(3x-5y)
= (6x-18y) - (12x-20y)
= 6x - 18y -12x + 20y
= -6x + 2y
= 2y - 6x