Check all that apply.

A. Her expenses are $25 per week.
B. She can earn $7 per week even if she does not knock on any doors.
C. She will lose $7 per week if she does not knock on any doors.
D. If she does not knock on any doors at all during the week, she will lose $25.

Question

Check all that apply.

 		A.	Her expenses are $25 per week.
 		B.	She can earn $7 per week even if she does not knock on any doors.
 		C.	She will lose $7 per week if she does not knock on any doors.
 		D.	If she does not knock on any doors at all during the week, she will lose $25.

jacob902 · Answer

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) = 7x - 25, 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?