Unit 5: Moving Straight Ahead Name ______

Hwk #6 – quiz review (Inv. 2.4)

1) The Arnold Family is considering changing phone plans. George gets information from three

different companies.

a) For each company, write an equation that shows how the total cost C

relates to the number of minutes x.

Moving Straight Ahead Homework #6 Verizon: ______

T- Mobil: ______

Sprint: ______

b) What information does the coefficient of x represent for each company?

Moving Straight Ahead Homework #6 c) For each company, what information does the y-intercept of the graph represent?

d) Suppose the Arnold family will need 500 minutes of talk time. What is the cost of each company?

Verizon: T-Mobile: Sprint:

Moving Straight Ahead Homework #6 e) Suppose the family has only $150 dollars to spend on a phone plan. For how many minutes could the

family talk according each plan?

Verizon: T-Mobile: Sprint:

Moving Straight Ahead Homework #6 2) The Ferry family decides to buy a new television on a payment plan. They’ve agreed to pay $15 per

month until the tv is paid off. Use the graph to answer the questions below.

a) How much did the Ferry family owe before they started making payments?

Explain.

Moving Straight Ahead Homework #6 b) Write an equation that represents the relationship between the amount the Ferry family still owes

and the number of months after the purchase. Explain what information the numbers and

variables represent.

c) After 7 months, how much money do they still owe. Explain how you got your answer.

Moving Straight Ahead Homework #6 d) You can see on the graph that the family will have the television paid off in 12 months. Show how

you could use your equation from part (b) to find this out how long before the family owes

nothing.

Moving Straight Ahead Homework #6 3) For the equation y = 5x + 2 answer the following questions.

a) What is the rate of change?

b) What is the y-intercept?

c) As the x value increases, what happens to the value of y?

Moving Straight Ahead Homework #6 d) List one pair of coordinates that would lie on the graph of this equation.

Moving Straight Ahead Homework #6