Question

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

• A. 2y = 5x
• B. 2y = 5
• C. 2x = 5
• D. 2x + 3y = 5

Answer 1

The correct option is C 2x = 5

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

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