In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
y = 1
point (2 , -3)
perdicular line = ?
Step 02:
y = 1 ===> horizontal line
m = 0
Slope of the perpendicular line, m’
m' = - 1 / m
m ' = - 1 /0 ===> undefined (infinite)
Point-slope form of the line
(y - y1) = m (x - x1)
point (2,-3)​ ===> x1 = 2 y1 = -3
x = 2 ===> vertical line
The answer is:
x = 2