# What is the equation of the line perpendicular to y=-2  that passes through  (4,-1) ?

$x = 4$
The graph of $y = - 2$ is a horizontal line, with a slope of $0$. The equation of the line that is perpendicular to it, has an undefined slope, and goes through the point $\left(4 , - 1\right)$ is $x = 4$