Question

If y is directly proportional to x, and y = 5 when x = 2, what is the value of y when x = 6?

Answer 1

y = 15

Explanation:

Given that y is directly proportional to x then the equation relating them is

y = kx ← k is the constant of proportionality.

To find k use the condition y = 5 when x = 2

k =
`(y)/(x)` =
`(5)/(2)` = 2.5, thus

y = 2.5x ← equation of proportionality

When x = 6, then

y = 2.5 × 6 = 15

Answer 2

it could be 2.2 because every 5 you get 2 so it would be 10 and 4 so when y=6 then x should be 2.2.