Question 665860
A quick, easy way to plot is to set x = 0 and solve for y, then set y = - and solve for x.  Then draw a line through those points.
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Red line: y = x-7
Green line: y = 2x-7
Blue line: y = 2x+7
{{{graph(200,200,-10,10,-10,10,x-7, 2x-7, 2x+7)}}}
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Red line: -2x + 7
Green line: x/5
{{{graph(200,100,-10,10,-5,10,-2x+7, x/5)}}}
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