Solve graphically x-y+1=0 and 3x+2y-12=0.
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when x=0
y=1 and y=0 x=-1
when x=0
y=6 and y=0 x=-4 and plot them
y=1 and y=0 x=-1
when x=0
y=6 and y=0 x=-4 and plot them
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