Question

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

• A. $xy+5$
• B. $x+4=0$
• C. $x^3+3=0$
• D. $x+2$

Answer 1

The correct option is B $x+4=0$

An linear equation in one variable is an equation which has only one variable, and the highest power of that variable is "one". Here, only $(x+4=0)$ is a linear equation in one variable.

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

$(x+2)$ and $(xy+5)$ are algebraic expressions. They are not equations.