Unit 5: Moving Straight Ahead Name ______
Hwk #6 – quiz review
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.
Verizon: ______
T- Mobil: ______
Sprint: ______
b) What information does the coefficient of x represent for each company?
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-Mobil: / Sprint: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-Mobil: / Sprint:2) The Ferry family decides to buy a new television on a payment plan. Thye’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.
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.
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.
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?
d) List one pair of coordinates that would lie on the graph of this equation.
Moving Straight Ahead Homework #6