Question 208758
Please help me solve the system of equations by graphing: 
x+y=4
x+y=-4 
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Rearrange:
y = -x+4
y = -x-4
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Graph:
{{{graph(400,300,-10,10,-10,10,-x+4,-x-4)}}}
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The lines are parallel; there is no solution for the system of equations.
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Cheers,
Stan H.