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

2 x + 3

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2 x^{2} = 3

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2 x + 3 = 0

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3 x^{2} = 5

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Solution

The correct option is C $2 x + 3 = 0$
An equation which has only one variable and the highest power of that variable is one is termed as a linear equation in one variable.

$(2 x + 3)$
is not an equation as it does not have an equality sign in it.

The highest power of $x$ in $(2 x^{2} = 3)$ and $(3 x^{2} = 5)$ is 2, so it is not a linear equation.

The highest power of $x$ in $2 x + 3 = 0$ is 1 and it has an equality sign, hence it is a linear equation in one variable.

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