# If y varies inversely with x, and x = -10 when y = 60. How do you find the inverse variation equation and use it to find the value of y when x = 15?

##### 2 Answers

#### Answer:

The equation is

At

#### Explanation:

Set

Given condition

So by substitution we have:

Multiply both sides by

But

Giving:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Suppose

#### Answer:

#### Explanation:

In an inverse variation, as one quantity increases, the other one decreases.

A proportion can be made into an equation by using a constant:

Use the two values given to find the value of

The equation can therefore be written as:

Now we know the exact relationship between

If