Help pleases

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

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?

What is the difference between the predicted value and the actual value