Representing Situations with Equations

Kiran’s backpack weighs 3 pounds less than Clare’s backpack. Clare’s backpack weighs 14 pounds. How much does Kiran’s backpack weigh?

Shayla has $200 and makes $17 per hour. Which equation represents the total amount of money Shayla has after working x hours?

• y = 17x + 200

• y = 17 + 200x

• y = 200 + 17

Bob has $150 in his savings account and saves $40 per month.  Which equation represents the amount Bob has in his account after x months?

• y = 150 + 40

• y = 40x + 150

• y = 150x + 40

Jimbo has $100 in his bank account. Every week he deposits $30 more dollars. Write an equation to represent the amount of money he has in his bank account 

• y = 100 - 30x

• y = 100 + 30x

• y = 100x + 30

• y = 100x - 30

Mike has a printing service. He charges $100 for the setup fee and $2 for each page printed. Write an equation for this situation.

• y = 2x + 100

• y = 100x + 2

• y = 2x - 100

• y = -100x + 2

Jerry has $20 and makes $7 per hour. Which equation represents the total amount of money Jerry has after working x hours?

• y = 7x + 20

• y = 7 + 20x

• y = 20 + 7

Talk time Phone Company charges $0.12 per minute of phone use plus a monthly service fee of $8.00 for its phone service.  Which equation below can be used to find c, the total cost for one month when m, minutes are used?

• c = 0.12m + 8m

• c = 8m + 0.12m

• c = 0.12m + 8

• c = 0.20m

What does the y represent in this equation?

• input

• rise over run

• starting point

• output