Question

If y varies directly with x and y=20 when x=4, find x when y=5

Answer 1

Explanation:

Our basic problem looks like:

y = qx

When we plug in our variables, we get:

20 = q * 4

To isolate q, we divide both sides by 4:

20 / 4 = q * 4 / 4, which becomes:

5 = q, leading to 5x = y

now to plug in our 5 variable:

5 * 5 = 25 = y