Direct Variation: If y = 12, when x = 4, find y when x = 20. a. 40 b. 48 c. 12 d. 60

d

Step-by-step explanation:

Given the x and y are in direct variation then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 12 when x = 4, that is

12 = 4k (divide both sides by 4)

3 = k

y = 3k ← equation of variation

When x = 20, then

y = 3 * 20 = 60 → d