shutterfly sells 8x10 photo prints for $2.62 an 16x20 photo prints $12.95. Your friends says that this doesnt make any sense because the dimensions of the large print are only twice as big as the small print. How could you explain these pricing differences to your friend?

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?