60 points.

the equation y=15x describes the amount of money louis earns, where x is the number of hours he works and y is the amount of money he earns. the table shows the amount of money carl earns for different numbers of hours works.

carl's earnings:
time (h)
3, 5, 8, 10
money earned ($)
45,75,120,150

(a) how much money does louis make per hour?
(b) how much money does carl earn per hour?
(c) who earns more money per hour? how do you know?