Question 74643
x+y=6
x-y=2
I'm trying to figure out how to solve this for graphing.
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Graphing is an "inexact" method of solving systems of equations
because the accuracy of the solution depends completly on the 
accuracy of the graph--and most of us are not very accurate is
drawing graphs.
So you do the best you can.
You graph the two lines and try to determine their point of 
intersection.
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If you add your two equations you get 2x=8; x=4.
Substituting will also give you y = 2
That information is helpful when you come to determining the 
point of intersection.
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{{{graph(400,300,-10,10,-10,10,-x+6,x-2)}}}
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Cheers,
Stan H.