Question

The value of y varies directly with x, when y = 4, and x = 9. What is the equation for the relationship?

Answer 1

Yeah I think her answer was correct

Answer 2

y =
`(4)/(9)`x

Explanation:

Given parameters:

y = 4

x = 9

y varies directly as x ;

Mathematically ;

y ∝ x

So;

y = kx

k is the constant of proportionality;

find k;

k =
`(y)/(x)`

k =
`(4)/(9)`

So,

Equation of the relationship is;

y =
`(4)/(9)`x