Question

Which equation describes a relationship that is directly proportional?

y= 9

y= 3x

y= .20

y= x + 4

Answer 1

Y=3x.
If you were to plot it out, it would be a longest function with a positive slope.

Answer 2

B.
`y=3x`

Explanation:

We are asked to find the equation that describes a directly proportional relationship.

We know that two proportional quantities are in form
`y=kx`, where, y is proportional to x and k is the constant of proportionality.

Upon looking at our given choices, we can see that equation represented by option B is in form of direct proportional equation, where k equals 3.

Therefore, the equation
`y=3x` is direct proportional equation and option B is the correct choice.