If she is starting on day 1 with 0 followers and advances up 2 followers every day, by day "n" she would have 28 followers.
The second one that you did
First mark a point at 4 on the y axis
Then because the slope is 3 you are going to rise three places up and one place to the right.
Use a ruler to connect the dots.
Hope this helps.
62
27
68 it’s very simple do the math