Question 103923
Solve the system by graphing.
3x + y = 6
3x – y = 0 
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Solve each equation for "y":
y = -3x+6
y = 3x
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Graphing y = -3x+6
Let x=0, then y = 6 giving you point (0,6)
Let x = 1, then y = -3+6 = 3 giving you point (1,3)
Plot these two points and draw a line thru them
{{{graph(400,300,-10,10,-10,10,-3x+6)}}}
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Graphing y = 3x
Let x = 0, then y = 3*0 = 0 giving you point (0,0)
Let x = 1, then y = 3*1 = 3 giving you point (1,3)
Plot these two points and draw a line thru them
{{{graph(400,300,-10,10,-10,10,3x)}}}
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Graph both lines on the same coordinate system to 
find the point of intersection:
{{{graph(400,300,-10,10,-10,10,-3x+6,3x)}}}

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Point of intersection is (1,3)
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Cheers,
Stan H.