Final answer:
A linear pair refers to a pair of adjacent angles that form a straight line and add up to 180 degrees.
Step-by-step explanation:
In mathematics, a linear pair refers to a pair of adjacent angles that form a straight line. This means that the angles add up to 180 degrees. When you have a linear pair of angles, they will have the same vertex and a common side. For example, if one angle measures 70 degrees, the other angle in the linear pair will measure 110 degrees to add up to 180 degrees.