Question

Which of the following are not linear functions? Place a check mark in the box next to each equation that is not a linear function.

A. x = 4
B. y = 5
C. y = 3x + 2
D. y = 2x 2 + 1
E. y = x 2

Answer 1

D. y = 2x² + 1

E. y = x²

Explanation:

Linear function:

A linear function has the following format:

`y = ax + b`

In which a is the slope and b is the y-intercept. A constant function is linear, as it is the special case in which a = 0.

In this question:

In options D and E, the highest exponent of x is 2, which means that they are not linear functions, and so these options are the answer.