Predicting Values

Using the two equations we created for direct and inverse variation, we can predict values of y given certain values of x.

For example, suppose we have the equation y = 5x. If we want to know the value of y if x = 3 then all we need to do is substitute 3 in for x in the equation y = 5x.

y = 5x
y = 5(3)
y = 15

If we use our inverse variation equation and want to know the value of y for x = 2, we follow the same procedure and substitute 2 in for x into the equation .

Next: Section A, page 12

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