Functions and Graphs
Inverse proportion

Functions and Graphs

• Direct proportion
• Inverse proportion
• Rational Functions
• Testing if a relationship is a function
• Checking if an equation represents a function
• Function notation
• Composite functions
• Range and domain
• Sign diagrams​

Two variables are inversely proportional if multiplying one of them by a number results in the other being divided by the same number.
If two quantities x and y are inversely proportional, we write:
\[y\propto \frac{1}{x}\]​
The variables are related by the following equation, where k is a constant:
\[y=\frac{k}{x}\]