Draw a slope triangle.
Rotate your slope triangle
around the origin to get a new slope triangle. What is the new slope?
Find the equation of a line perpendicular to
Look at the slopes in parts (a) and (b). How are perpendicular slopes related?
Use the eTool link to graph the function, then draw and rotate a slope triangle.
Click the link at right for the full version of the eTool: 2-58 HW eTool (Desmos)