Writing and interpreting linear functions

A plumber charges $80 for a service call. He then charges $160 per hour.  Write a linear equation to model this situation if x represents the number of hours the plumber works

• y=80x+160

• y =160-80x

• y = 160+80x

• y=80+160x

Maggie buys a Chromebook for $200. It decreases in value each month by $20. Write an equation for the total value of the Chromebook.

• 
  

   $20x+200=y$  
  

•  $20x-200=y$  

•  $200+20x=y$  

•  $200-20x=y$  

What form is this line in? y = 6 - 3x

• Standard Form

• Slope intercept form

• Point slope form

• Slope standard Form

Write an expression to model a person who began at 4ft and grows 1/4 ft per year.

• 4y + 1/4

• 4y - 1/4

• 4 + (1/4)y

• 4 - (1/4)y

Casey wants to buy a DVD for $14 and some CDs that cost $12 each

• 12 + 14x

• 12x + 14

• 14 - 12

• 50x + 12

You want to rent an SRT to drive it to the beach. The rental charges $8.50 an hour plus a rental fee of $25.50. Which equation represents the total charges for x hours?

• y = 8.5 + 25.5
• y = 25.5 + 8.5x
• y = 8.5 + 25.5x

Today a waitress at Olive Garden made $4 for every hour she worked plus $125 in tips.

• y = 125x + 4

• y = 4x + 125

• y = 129x

• y = 4x + 125x

Linda has $50 and plans to save $12 each week.

What is the "m"?

• m=12

• m=50

• m=62

• m=38

9. A taxi charges a flat fee of $5 plus $1.50 per mile driven. Write a linear equation to represent the total cost (C) in terms of the number of miles driven (m).

• C = 1.50m + 5

• C = 5 + 1.50m

• C = 1.50m - 5

• C = 5m + 1.50

Sonia has $40 in her lunch account and pays $2 each day to eat lunch. How much money will Sonia have left in her account after 11 days?

• $62

• $18

• $22

• $13