3
Bill and Laura mow lawns during the summer to earn money. They each
calculate their start-up expenses, operating expenses, and income per hour
of mowing. Bill and Laura write the following equations for their total
income (y) after mowing for x hours.
Bill: y=9.10x-125
Laura: y = 9.10x-100
a. Graph each equation on the same coordinate plane. Use x-values from
zero to 20 hours.
b. Before Bill and Laura each mow their first lawn, what is their total
income? Explain your answer.
c. After mowing for 20 hours, what is each of their total incomes?
d. If both Bill and Laura work the same number of hours, when will Bill
have the same total income as Laura? Explain your answer.
