Question

Please help !! question is shown below in the picture

Answer 1

C

Explanation:

Given 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 = 20 , y = 10 then

10 = 20k ( divide both sides by 20 )

`(10)/(20)` =
`(1)/(2)` = k

y =
`(1)/(2)` x ← equation of variation → C