and the graphs of the tangent lines to this curve at the points (8,8) and (-8,-8).

1. Choose Beginning Calculus from the initial menu and press .
2. Use the arrow keys to move to the menu item Graph F(x,y)=c, press and .
3. At the prompt F(x,y) =, enter the formula x^(2/3) + y^(2/3)
4. and use the bounds

   x0 = -25 x1 = 25

   y0 = -25 y1 = 25

5. At the prompt, N = , enter 1 and
6. at the prompt, c_1 = , enter 8 You will then see the graph of this relation.

   

7. Press .
8. Use the arrow keys to move to Superimpose and press .
9. At the prompt, F(x,y)=, type in y+x .
10. At the prompt N= just enter 2 and
11. at each of the following prompts, enter

    c_1 = -16

    c_2 = 16