What is the formula for directly proportionate?

  y = kx

Step-by-step explanation:

Y is directly proportional to x if the relation can be written using the equation ...

  y = kx . . . . . for some constant k

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Note that k may be positive or negative. The graph of this equation is a straight line through the origin.

The value of k can be found from corresponding values of x and y using ...

  k = y/x

This is also another way to express the fact that x and y are proportional.

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step-by-step explanation: