Equation of the line. Slope-intercept

How do you know which one is Y2? or Y1?

 

Should it look something like this:

 

-7-3

_____

-3-1

Thank you both for your responses; however, this is a lot to remember. Is there an easier way? I am really horrible with math, always have been since 3rd grade when calculators were introduced (I stopped using my brain at that point), please help me find an easier solution.

Hi Grace,

 

Unfortunately, too many students are in your situation.  Math really should be enjoyable.  Have you seen videos on Khan Academy?  I hope this helps you (you can copy and paste this address to your browser address bar):

There is no rule as to which one is y₁ or y₂.  Your equation for slope is correct.  It will produce the result of -10/-4 which is 10/4 which is 2.5.  This is the same result we reached.

 

I know it seems difficult.  But you will conquer it with enough practice.

Thanks again for replying. I really appreciate the help :) I will check out the videos.