Writing Equations from Stories

You want to buy b number of bagels that cost $2 each. Which expression below represents the cost of the bagels?

• $2

• $2b

• b

• Not sure

A grande latte from Starbucks costs $4. If you buy x amount of lattes, write an expression that represents the total cost of the lattes.

Mario joins a gym. The gym has an initial new member joining fee of $30. Then, Mario pays $5 per fitness class.

Which equation below represents the total cost, y, Mario will pay at the gym based on the number of fitness classes, x, he takes?

•  $y=5x$  

•  $y=30+x$  

•  $y=35$  

•  $y=5x+30$  

Mario joins a gym. The gym has an initial new member joining fee of $30. Then, Mario pays $5 per fitness class. The cost of Mario's gym is represented by the equation

 $y=5x+30.$  

Which number is the y-intercept, representing the initial cost?

Roshelle is a babysitter. She charges a $20 base fee then $8 per hour after that. Write an equation to represent the total cost to hire Roshelle.

Write a story to explain the equation below.

 $y=2x+10$  

Jayson starts with $35. He loves to buy Takis, which cost $2.25 per bag. Which equation represents how much money Jayson has based on how many Takis he buys?

• $y=2.25x+35$

• $y=35x+2.25$

• $y=35-2.25x$

• $y=-2.25x$

Write a story to represent the equation below:

 $y=75-5x$