Question

which equation represents the line passing through the points 3,2 and negative 9,6

Answer 1

First, find the slope.
\[(y _{1}-y)/(x_{1}-x)\]
Recall that that is the formula for slope. Does it look familiar?

Answer 2

eqn of line from two points say (a,b) is y-b=slope*(x-a) . i think this might help slope can be found by above formula in comment by Nory