solve the pair of linear equation 2x+y=0 and x-y=2
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x-y=2
=> x=2+y
2x+y=0
=> 2(2+y)+y=0
=> 4+2y+y=0
=> 3y= -4
=> y= -4/3
x=2+y=2-4/3=(6-4)/3=2/3
so , x=2/3, y= -4/3
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