# Tips and Tricks on Direct & inverse variation

For direct variation, if the value of x is increased, then y increases as well.

Both variables change in the same manner. If x decreases, so does the value of y. We say that y varies directly as the value of x.

Both variables change in the same manner. If x decreases, so does the value of y. We say that y varies directly as the value of x.

2

A direct variation between 2 variables, y and x, is a relationship that is expressed as:

y = kx

where the variable k is called the constant of proportionality.

In most problems, the k value needs to be found using the first set of data given.

y = kx

where the variable k is called the constant of proportionality.

In most problems, the k value needs to be found using the first set of data given.

3

An inverse variation between 2 variables, y and x, is a relationship that is expressed as:

y = k/x

where the variable k is called the constant of proportionality.

As with the direct variation problems, the k value needs to be found using the first set of data.

y = k/x

where the variable k is called the constant of proportionality.

As with the direct variation problems, the k value needs to be found using the first set of data.

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