Help I need the right answers for a-d thx

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

If 3x+8=3x+8 is it one solution or no solution

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)