Given:

x = a

by + c = 0

To find:

Angle between the lines x = a and by + c = 0.

Concept Used:

Angle between two lines.

Explanation:

The given lines can be written as

x = a … (1)

y = -cb … (2)

Hence, Lines (1) and (2) are parallel to the y-axis and x-axis, respectively. Thus, they intersect at right angle, i.e. at 90°.