Question

6. Johnny is a plumber, and Darnel is an electrician. Johnny

charges customers a fee of $150 just to come to their house
and then $75 per hour that he is there. Darnel charges a fee
of $50 for a home visit, plus an additional $125 per hour. How
long do they work to earn the same amount?
a

Answer 1

• 2 hours

Explanation:

Equations for each

Johnny:

• J(x) = 75x + 150

Darnel:

• D(x) = 125x + 50

In order to get J(x) = D(x) we need to make right sides equal and solve for x:

• 75x + 150 = 125x + 50
• 125x - 75x = 150 - 50
• 50x = 100
• x = 2