Question 1083688
The diagonal from B to D; from (-2,-2) to (6,4).


slope  {{{(4-(-2))/(6-(-2))=6/8=3/4}}}

{{{y+2=(3/4)(x+2)}}}

{{{4y+8=3x+6}}}

{{{4y-3x=6-8}}}

{{{4y-3x=-2}}}

{{{highlight(3x-4y=2)}}}
or
{{{y=(3/4)x-1/2}}}



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NOTE: plotting the points helps.  You can easily identify the sides and the diagonals.