Question

If y varies directly as x, and y is 20 when x is 4, what is the constant of variation for this relation?

1/5
4/5
5
16

Answer 1

Explanation:

y = k*x This is the formula for a direct variation.

• y = 20
• x = 4 Substitute these values into the direct variation

20 = 4 * k Divide by 4

20/4 = 4k/4

k = 5

Answer: the constant of variation is 5