Answer and Explanation
Your Answer is
Correct Answer is E
Explanation
Calculate the analytical formula of the straight line through two points as y = 0.075x +45, and then bring the value of x=400 into the solution to get the y value of 75.
Use the following information to answer questions 49-51.
The DigiPhone Company advertises the following calling plans:
51. In the standard (x,y) coordinate plane, the points (600, 89.99), (1,000, 119.99), and (1,400, 149.99) are collinear. DigiPhone wants to offer a new plan that includes 400 minutes of calling time for a charge in line with those of its other plans. If $z represents the before-tax charge for this new plan, what should be the value of z so that (400,z) is on the in same line as the points representing the other plans?