Hey there!
Let's use our slope given two points formula:
m = y2-y1/x2-x1
In number 5, we're given 4 points. (0,3), (1,5), (2,7) and (3,9)
For this formula, we need two points. We'll use (0,3) and (1,5).
Plug in our values:
5-3/1-0 =
2/1
= 2
Therefore, the slope is 2.
You did this formula perfectly on number 4.
Hope this helps!