Thread: YPIP 2013 State Bank of Pakistan
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Old Sunday, October 27, 2013
raazid raazid is offline
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2x-6=y, 3x+y=4 find 3y?


multiply first equation by 3
6x-3y=18
multiply second equation by 2
6x+2y=8

now subtract second from firs
6x-3y=18
-6x-2y=-8
-5y=10
y=-2
3y=-6
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