If y varies directly as x, and y = 7 when x = 3, find y when x = 7

Question

asked Jan 21, 2022 56.3k views

1 Answer

Catalin Marin · Answer 1 · 2022-01-26T04:57:27+0000

Answer:

Direct variation, by definition, has the form shown below:

y=kx

Where k is the constant of proportionality.

Given the information in the problem, you can find k:

7=3k

k=7/3

Now you can find y when x=7 as following:

y=(7/3)x

Substitute values.

y=(7*7)/3

y=49/3