Question

If x varies direct as y and x= 3 when y=12, find the relationship between x and y​

Answer 1

y = 4x

Explanation:

Given that x and y vary directly then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition x = 3 when y = 12

k =
`(y)/(x)` =
`(12)/(3)` = 4

y = 4x ← equation of variation