Question 189797
They are giving you the slope of a line and a point on that line. 
That is enough data to define the line.
The general formula is:
{{{(y - y[1]) / (x - x[1]) = m}}}
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m = 2
(7,6)
{{{(y - 6) / (x - 7) = 2}}}
Multiply both sides by {{{x - 7}}}
{{{y - 6 = 2*(x - 7)}}}
{{{y - 6 = 2x - 14}}}
Add {{{6}}} to both sides
{{{y = 2x - 8}}}
The graph is:
{{{ graph( 500, 500, -10, 10, -10, 10, 2x - 8) }}}