Answer:
y = 6
Step-by-step explanation:
The line x=4 is a vertical line. So, a perpendicular line will be horizontal.
Horizontal lines have an equation of the form ...
y = constant
In order for the line to go through a point with a y-coordinate of 6, the constant in the "y =" equation must be 6.
y = 6 . . . . . the desired equation
