The school cafeteria has 285 cartons of juice in stock Each day total of 60 cartons are sold. What equation is a function rule that represents this situation?

Question

Answer Choices

 

A. y = 285 + 60x
B. y = 60x − 285
C. y = 285 − 60x
D. y = 60x + 285

Answer 1

Y is the number of cartons present

 

X is the number of days past

 

Y = 285 - 60X  states:

 

There are Y cartons which equals 285 (beginning amount)

minus 60 times X the number of days

 

Example, after 4 days:

 

Y = 285 - 60 (4)

 

Y = 285 - 240

 

Y = 45