Tidbits about Inequality Graphing

 Can I shade just the answer without the overlaps?

You can shade the area between two graphs.  The Shade command shades the area that is specifically above the lower function and below the upper function.
Only the areas where lowerfunc < upperfunc are shaded.

Demo:  Solve

• Enter Y1 = x + 1 and Y2 = -x + 1
• Graph to determine which graph is the "upperfunc".  In this problem it is Y1.  Think of the "upperfunc" as "function to shade below"(Be careful not to confuse the "upper" function with the "greater than" symbol.)
• Press DRAW (2nd PRGM) and choose option #7 Shade(
• Type Shade(Y2, Y1)

The Shade parameters are:

Shade(function to shade above, function to shade below, left bound, right bound, the pattern (a number from 1 to 4), pattern resolution (a number from 1 to 8))

 Can I make it shade ONLY between three lines?

You have to be rather creative to get the calculator to shade only between three lines.
In most cases, it will be more work than worth.

Demo:  Solve