Question

Which of the following is a linear expression:

• A. $x^2+1$
• B. $y+y^2$
• C. $4$
• D. $1+z$

Answer 1

The correct option is D

$1+z$

Determine the linear expression.

The degree is the highest power of the terms of variables in the expression. The expression with degree one is called linear expression.

The degree of $x^2+1$ and $y+y^2$ is two.

The degree of $4$ is zero.

The degree of $1+z$ is one.

So, $1+z$ is linear and the correct option is $\mathrm{D}$.