Describe how you would write the equation for the relationship between the number of photos ordered and the amount paid.

Answer:

To write the equation, I would first identify the ordered pairs from the data provided: (5, 2.70), (11, 3.24), and (20, 4.05). Next, I would calculate the slope (m) by finding the ratio of the change in cost to the change in the number of photos. Using two points, the slope is 0.09. Finally, I would use the point-slope form or substitute the slope and one point into the slope-intercept form (y = mx + b) to solve for the y-intercept, resulting in the equation y = 0.09x + 2.25.