Question

If y varies directly with x and y = 28 when x = 4, what is y when x = 3?

Answer 1

y=21

Explanation:

Since x and y vary directly, they will be proportionate to each other. In this case, y is 7 times larger than x. We know this because 28/4=7. So, the equation that describes their relationship is y=7x. This means that to find y plugin x. Therefore, y=21 because y=7(3).