# Inverse variation

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##### Intros
###### Lessons
1. What is an Inverse Variation?
2. How to solve inverse variation problems?
##### Examples
###### Lessons
1. Identifying Indirect Variation Equations
Classify the following variations. (Direct or Indirect).
1. $b = -8a$
2. $m = \frac{n}{5}$
3. $p = \frac{-2}{q}$
4. $s = \frac{1}{7} \times t$
2. Identifying Indirect Variation Graphs
3. Evaluating Indirect Variations
Find the missing variable.
1. $y$ varies inversely with $x$. If $y=22$ when $x=-17$, find $y$ when $x=11$.
2. $y$ varies inversely with $x$. If $y=30$ when $x=18$, find $x$ when $y=5$.
4. Word Problem: Application of Indirect Variations
The time it takes to fly from Canada to China varies inversely as the speed of the plane. If the journey takes 13 hours at 950 km/h, how long would it take at 650 km/h?
###### Topic Notes

In this lesson, we will learn:

• Identifying Indirect Variation Equations
• Identifying Indirect Variation Graphs
• Evaluating Indirect Variations
• Word Problem: Application of Indirect Variations