Lisa sells cookies and gets a business where she pays $100 a month. If each cookie is $2 and there are 30 people in the store each week, how much money does she make in a month?
What's the y intercept
Does each person buy just one cookie? if so, then the profit y on a month of 4 weeks is
y = 2*30*4 - 100
For x people per week, that would be
y = 8x-100