Question 1006104
Too many questions in one posting.  Here is #3.


Slope {{{m=(9-6)/(7-(-4))=3/11}}};  using point-slope form,  {{{y-9=(3/11)(x-6)}}},
and changing into Standard Form,
{{{11y-99=3(x-6)}}}
{{{11y-99=3x-18}}}
{{{11y-3x=-18+99}}}
{{{-3x+11y=81}}}
OR
{{{highlight(3x-11y=-81)}}}




#1,2,4  can be done like this video example shows:
<a href="https://www.youtube.com/watch?v=VDKztVZUgnM">Equation for line given two points</a>