Roger has one homework problem. He was asked to write his own linear real-world problem and use Slope-Intercept Form in his equation. He decides to pretend he is a lifeguard at an indoor pool who is working to save money for his class trip. He knows he will have money to start and then add to it over time. Choose the fact that he DOES NOT need to include in his problem before he completes his homework assignment.

a) The amount of money he needs to go on his trip, used as y in his equation

b) His initial amount of money saved before working, used as the y-intercept in the equation

c) The number of hours he will work after returning from his trip

d) His hourly wage as a lifeguard, used as slope in the equation