Question

Jessica is selling books during the summer to earn money for college. She earns a commission on each sale but has to pay for her own expenses. After a month of driving from neighborhood to neighborhood and walking door to door, she figured out that her weekly earnings are approximately a linear function of the number of doors she knocks on. She writes the equation of the function like this: E(x)=7x-25, where x is the number of doors knocks on during the week and E (x) is her earnings for the week in dollars. Which of the following are reasonable interpretations of the y-intercept of Jessica’s function? Check all that apply

Answer 1

The slope represents the rate of change of earnings in a week for every unitary change in number of doors knocked. For Jessica's function, her earnings change by +7 units for every unit of door she knocks.