Question 942732
You have the right idea.


Subscript 1, (-2,2);
Subscript 2, (2,-12);
{{{m=(-12-2)/(2-(-2))=-14/4=-7/2}}}.


Now, take your pick:  Use either slope-intercept form or use point-slope form.  


If slope-intercept,
y=mx+b, and you know m.
b=y-mx, and just pick either of the given points for x and y.