Question

The variables x and y vary directly. Use the values to find the constant of proportionality and write an equation that relates x and y. y=8; x=2

Answer 1

y = 4x

Explanation:

If y is directly proportional to x (which is what I assume you are meaning in this question), this means that

y = kx, where k is the constant of proportionality.

To find k, we simply substitute in the given x and y values, and solve for k. i.e we to get:

8 = k x 2.

k = 8/2 = 4.

so y = 4x