# Linear Pair

How to solve linear pair problems: example and its solution.

## Example

A linear pair are angles

whose sum of the adjacent angle's measures is 180.

They have a common side

and a common vertex (red point).

These two angles are a linear pair.

So (13*x* + 1) + (7*x* + 9) = 180.

The differece between a linear pair

and supplementary angles is that

supplementary angles don't have to be adjacent.