Question

Which equation has a constant of proportionality equal to 5?

A. y = 5x

B. y = 10/5x

C. y = 5/25x

D. y = 1/2x

Answer 1

A

Explanation:

The standard equation of proportion is

y = kx ← k is the constant of proportionality

A

y = 5x is in this form with k = 5

B

y =
`(10)/(5)` x = 2x with k = 2 ≠ 5

C

y =
`(5)/(25)` x =
`(1)/(5)` x with k =
`(1)/(5)` ≠ 5

D

y =
`(1)/(2)` x with k =
`(1)/(2)` ≠ 5