Question

The time is took Tayna to complete different sets of math problems varied directly with the number of problems in the set Tayna's data is shown in the table. If x = time, and y = the number of problems in the set, which equation models Tayna's direct variation

A. y = 12x
B. y = 1.2x
C. y = x divided by 12
D. y = x divided by 1.2

Answer 1

C

Explanation:

time is directly proportional to the number of problems in the set

=> x = ky

k = constant of proportionality

when k = 12

x = 12y

by making y the subject, we divide both sides by 12

=> y = x/12