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

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 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

anonymous · Answer

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

retireed · Answer

What is Y when X = 0?

Earning is linearly dependent on the number of doors she knocks on minus expenses.

Earnings  =  7x - 25