Answer:

Explanation:
For this situation we have the equation
, where each variable represents a coordinate (e.g. in this case 4 could be
). So first, let's define which coordinates will be the values of these variables:
(3,4):

(5,9):

Now we need to replace each variable with its given value:

And then do the subtraction to simplify:

Therefore, the slope of the line that passes through the points (3,4) and (5,9) is
.