The equation y = 55x 85 describes the amount of money a plumber charges, where y is the total amount he charges and x is the number of hours he works.

The table shows the total amount of money an electrician charges.

How much does each charge per hour?

Number of hours worked 1 2 4 7

Total amount charged 115 180 310 505

The plumber charges $ __per hour.

The electrician charges $ ___per hour.