Instead of doing your problem for you, I'll do one exactly in every detail like
yours. Use it as a model for your problem. The problem I will do is this:
find the equation of the line that passes through the point (-14,15) and
(7,-3) in POINT-SLOPE FORM
First we find the slope m using the slope-formula:
Substitute (x1,y1) = (-14,15) and m = -6/7 into
y - y1 = m(x - x1)
y - (15) = (-6/7)(x - (-14))
That's it in point-slope form.
If they had said to write your answer in slope-intercept
form you would have had to take it further to the form y=mx+b:
y-15=(-6/7)x-12
y=(-6/7)x+3
Edwin