Which one is a linear equation?

$3 x + 2 y = 1$

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$x^{2} = 1$

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$2 x > 9$

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$\frac{x}{y} = \frac{y}{x}$

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Solution

The correct option is A
$3 x + 2 y = 1$

Linear equation is an equation with two variable when plotted on a graph ,then it gives a straight line.
So , $3 x + 2 y = 1$ is the equation with two variable
Hence , option (a) is the correct option.

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