Which of the following has a graph that is a fraught line? equation 1: y = 2x + 7
equation 2: y^2 = x - 1
equation 3: y= 2x^2 +4
equation 4: y= 3x^3

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?