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 plummer charges $___ per hour
the electrician charges $___ per hour
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