Question 1088156
Slope = {{{ m = (y[2] - y[1]) / (x[2]-x[1]) }}} 

Where  ( {{{ x[1]}}},{{{y[1]}}} ) and  ( {{{ x[2]}}},{{{y[2] }}} ) are two points on the line.

   {{{ (-2 - h) / (4 - 7)  = 3 }}}
   {{{  -2-h = 3*(-3) }}}
   {{{    -h = -9 + 2 }}}
    {{{ h = highlight(7) }}}