Jawabanmu

2014-02-05T23:31:52+07:00
X + y = 30            x2
5x - 2y = -8          x1

eliminasi variabel y
2x+2y = 60
5x-2y=-8 (+)
7x = 52
x=52/7

2x+2y=60
2(52/7)+2y = 60
104/7 + 2y = 60
2y = 60- 104/7
2y = 316/7
y = 316/14
y = 158/7