Question

Suppose y varies directly with x. If y = 3 when x = 2, what is the value of x when y = 5?

Answer 1

When `y=5`, `x=10/3`.

Explanation:

If y varies directly with x, they must always be proportional to each other.
`3/2=5/x`
By cross-multiplication:
`3x = 10`
`x = 10/3`