Question 103169
{{{-d/7 = -13}}}  first you multiply both side by {{{-7}}} in order to eliminate negative sign and fraction

{{{(-d/7)*(-7) = -13*(-7)}}}  

then we have

{{{d = 91}}}   

{{{1/3s+7/9=4/3s}}}
{{{7/9=4/3s -1/3s}}}
{{{7/9=3/3s }}}
{{{7/9=s }}}
or
{{{s = 7/9 }}} 

This equation defines a horizontal line. There is no {{{x}}} intercept, and {{{y}}} intercept is {{{7/9}}}.