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

If you would like to know how much does each charge per hour, you can calculate this using the following steps:

x ... the number of hours
a plumber: y = 55x + 85 = 55 * 1 + 85 = 55 + 85 = $140 per hour
an electrician: y = $115 per hour

The correct result would be: the plumber charges $140 per hour and the electrician charges $115 per hour.

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Step-by-step explanation: