Question

a new car slaesman receives a base salary of $500 wkly and $20 for every car he sells, a used car salesman receives a base salary of $600 wkly and $15 for every car he sells

a. using a system of equations how many cars would each salesman have to sell in a week for their earnings to equal
b if a salesperson could sell ten cars in 1 wk, would she make higher tatal salary selling new cars or used ones