Which of the following equations represents a line parallel to y-axis?

2y = 5x

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2y = 5

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2x = 5

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2x + 3y = 5

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Solution

The correct option is C 2x = 5
The line $2 x = 5$ is parallel to the y-axis since $x = \frac{5}{2}$ for any value of y.

$2 x = 5$ can be written as $2 x - 5 = 0$ .
Comparing it with the standard form $a x + b y + c = 0$ , we have
$b = 0$
Thus, 2x - 5 = 0 is parallel to y-axis.

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