Question

Which of the following is a linear expression in one variable?

• A. $x^2+3=0$
• B. $x+5=0$
• C. $xy+5$
• D. $x+5$

Answer 1

The correct option is D

$x+5$

An algebraic expression which has only one variable and the highest power of that variable is "one" is termed as a linear expression in one variable. Here, only $(x+5)$ is a linear expression in one variable.

$(x+5=0)$ is a linear equation as it contains an 'equal to' symbol. It is not an algebraic expression.

$(x^2+3=0)$ is an equation, the highest power of the variable is two. Hence, it is not a linear expression.

$(xy+5)$ is an algebraic expression but it is not a linear expression in one variable as it contains two variables.