Jawabanmu

2014-08-22T17:27:49+07:00
5x+2,2x=3y-y=7
2,8x=2y=7
2,8x=7
x=7/2,8
x=2,5
2y=7
y=7/2
y=3,5
x.y=2,5*3,5=8,75