Which equation represents the line that passes through the points (6 -3) and (-4 -9)

First of all you neeeeeed to make sure you know the formula for slope!
which is...
                y2 - y1
    m  =   -----------
                x2 - x1

and since they already gave you two x and y coordinates this is really simple:)  first of all you need to understand what is y2, y1, or x2, x1
taking the points (6,-3) i hope u understand that 6 is the x and -3 is the y.    so knowing that information you always remember to use the information in the order that they gave it to you. i will add an extra link to help explain. Sooo then knowing that you plug it into the formula that I gave you earlier 
so look at the next link that i made:)  
so your slope is 6/5! or 1.2 as a decimal
hopefully you would know what an equation looks like but just in case this is it      y = mx+b 
 so your equation looks like this y = 1.2x -3 
  where did i get the -3?
well look at first x and y coordinate thats your first y intercept:))
hope i helped!!.... and that this was right lol
let me know if it was correct thanks.