Answer:
B
Explanation:
y =
is the equation of a horizontal line, parallel to the x- axis and passing through all points with a y- coordinate of

A line perpendicular to it will be a vertical line parallel to the y- axis, with equation
x = c ( c is the value of the x- coordinates the line passes through )
the line passes through (- 6, - 9 ) with x- coordinate - 6 , then
x = - 6 ← equation of perpendicular line