Chapter 2.1, Problem 93E

To determine

a. The graph of the functions $y=2x$ and $y=-\frac{x}{2}$ in the standard viewing rectangle and to check whether the lines appear perpendicular.

b. The graph of the functions in the viewing rectangles.

i. [-15, 15, 1] by [-10, 10, 1]

ii. [-10, 10, 1] by [-3, 3, 1]

iii. [-3, 3, 1] by [-2, 2, 1]

and to check whether the lines appear perpendicular in any of these cases.

c. The viewing rectangle where perpendicular lines will appear perpendicular.