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

y  =  x

Step-by-step 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  =  

             k  =  

So,

  Equation of the relationship is;

            y  =  x

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step-by-step explanation:

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