draw the group of 2x- y-4= 0
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2x-y=0+4
2x-y=4
x-y=4/2
x-y=2
......... so from above solution it is clear that....
x=2+y
y=2-x
2x-y=4
x-y=4/2
x-y=2
......... so from above solution it is clear that....
x=2+y
y=2-x
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