Question 1063154
First, we need to put 
{{{x=y/9+7 }}}
into standard form:   {{{ Ax + By  = C }}}   where A,B,and C are constants (some will say A,B,and C must be "integers" but that is not true.  However, if they do happen to be integers then you should try to reduce integer coefficients to the point that A,B, and C have no common factors.   Some will also define such that A>0 but my Calculus book does not impose that restriction. ).
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An "alternate" standard form for the equation of a line is {{{ Ax+By+C = 0 }}}  and this is form I prefer.
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Re-arranging your starting equation:
{{{ x - 7 = y/9 }}}
{{{  9x - 63 = y }}}
{{{highlight( 9x - y - 63 = 0 )}}}   <<< alt standard form
{{{ highlight(9x-y = 63 )}}}     <<< standard form