Anna wants to take fitness classes. she compares two gyms to determine which would be the best deal for her. fit fast charges a set fee per class. stepping up charges a monthly fee, plus an additional fee per class. what is the system of equations representing these costs?

Assuming that she goes every day of the month and one month has 30days:
Let the fee per class of Fit Fast be x.
Let the fee per class of Stepping Up be y.
Let the fee per month of Stepping Up be z.
Fit fast fee(if she does for this choice) - 30x
Stepping up fee(if she does for this choice) - 30y + z

Im not sure of what the costs are as you did not state but here it is...hope this helps:)