Jawabanmu

2014-01-23T20:09:29+07:00
2x + y=5
y= 5-2x.................(1)

x + 2y=7
x+ 2(5-2x)=7
x+10-4x=7
-3x=-3
x=1......................(2)


2x+y=5
2(1)+y=5
2+y=5
y=3.........................(3)


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