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.

which of the following are reasonable interpretations of the y-intercept of jessica's function?

a. she will lose $20 per week if she does not knock on any doors.

b. she can earn $20 per week even if she does not knock on any doors

c. if she does not knock on any doors at all during the week, she will lose $50

d. her expenses are $50 per week