Practice!

Sample Problem

Congratulations! J You have scored a job with McDonalds this summer. Your wage is $2.00 per hour plus $0.02 for each hamburger you sell. So, your hourly wage y in terms of the number of hamburgers you sell x is y=2+0.02x.

a)What is the inverse function? (Keep your answers rounded to the nearest whole number)

Y=x -

 

b)Determine the number of hamburgers you have sold when your total earnings in an hour is $100 (keep your answers rounded to the nearest whole number).

hamburgers

 

Solution

a)Solve for x.

Y=2+0.02x, 0.02x=y-2, X=50(y-2)

X=50y-100, Now swap x and y:

y=50x-100

b) Y represents the number of hamburgers you sell and x is your total earnings (your total hourly wage).

y=50(100)-100=4900 hamburgers