Question 957891
The equation given is a horizontal line. The perpendicular line would be vertical, and the slope of a vertical line is undefined: it also does not intercept the y axis.
The line perpendicular to y=3 through the point (-5,-3) is x=-5
{{{ graph( 500, 500, -7, 3, -5, 5, x-x=3)drawing( 500, 500, -7, 3, -5, 5,green(line( -5, -10, -5, 10)))}}}
Again, a vertical line can not be written in slope intercept form.