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 figures 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) = 20x - 50, where x is the number of doors she knocks on during the week and E (x) is her earnings for the week in dollars.
What does the slope of Jessica's function represent?
a. For each additional set of books she sells, her earnings will increase by $20.
b. For each additional door she knocks on, her earnings will increase by $20.
c. For each additional set of books she sells, her earnings will increase by $50.
d. For each additional door she knocks on, her earnings will increase by $50.
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