solve the following system of linear equations GRAPHICALLY : 2x-y=1 and x-y=-1
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2x-y=1______1
x-y/=-1______2
2x=1+y
x=1+y/2_______3
x=-1+y_________4
x=1+y/2
x=1+1/2
x=2/2
x=1
x=1+y/2
x=1+3/2
x=4/2
x=2
x=-1+y
x=-1+3
x=2
x=-1+y
x=-1+12
x=10
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