Anita earns 60 points every time she shops at a grocery store. She needs a total of 2580 points to receive a free prize. so far, she has earned 480 points. How many times will Anita have to shop at the grocery store in order to earn the additional points she needs for a free prize?

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?