Which of the following is an equation in one variable?

2 x + 3 y = 0

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x + 2 y = 0

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2 x + 3 = 0

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Solution

The correct option is C $2 x + 3 = 0$
The expression $2 x + 3 y = 0$ has two variables x and y
The expression $x + 2 y = 0$ also has two variables, x and y
$2 x + 3 = 0$ has one variable, which is x. Hence it is an expression in one variable. The degree of this expression, or the highest exponent on x, is 1.
5 is a constant. It has no variables.

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