Problems N and O

Problem N

What is the rate of change for the first and second savings plans? How do the two lines compare?
There is a rate of change of $10.

The lines have the same slope and different Y intercepts.

Problem O

When will the first and fourth plans have the same amount of money in the account?
What will that amount be?

They will be the same at 5 months, and the amount will be $75.