A linear equation is of the general form y = mx + b. This is a function if f(x) gives a unique value.

If y = f(x) = k, where k is a constant, for any value of x, y = f(x) has the same value. As a result y = k is a linear equation but not a function.

**A linear equation does not represent a function when there is more than one value of x that gives the same value of y.**

## We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

- 30,000+ book summaries
- 20% study tools discount
- Ad-free content
- PDF downloads
- 300,000+ answers
- 5-star customer support

Already a member? Log in here.

Are you a teacher? Sign up now