### Home > INT2 > Chapter 1 > Lesson 1.3.1 > Problem 1-80

1-80.

Graph the line on graph paper.

Draw a slope triangle.

Rotate your slope triangle

around the origin to get a new slope triangle. What is the new slope? Write an equation of a line perpendicular to

.Look at the slopes in parts (a) and (b). How are perpendicular slopes related?

Use the eTool below to graph the function, then draw and rotate a slope triangle.

Click the link at right for the full version of the eTool:* **Int2 1-80 HW eTool*