Question

Find the equation of the line passing through (−5, 7) and parallel to y-axis.

Answer 1

The slope of the line parallel to y-axis is not defined.

That is slope of the line is tan 90° and hence the given line is parallel to y-axis.

(x₁, y₁) = (−5, 7)

Required equation of the line is

x − x₁ = 0 

x − (−5) = 0

x + 5 = 0