Question

What is a regression equation?

Answer 1

An approximation of the numerical relationship between two variables

Explanation:

When you want an equation that can give you a value of y for a given value x, based on existing data, very rarely will you have an equation that represents the relationship perfectly (not in a perfect line, etc.), so a regression equation, in general, is a method by which an approximate linear (or other) equation can estimate the relationship between x & y.