6.    2
7.    -5
8.    9
9.    0
10.    undefined
11.    2nd quadrant
12.    Anything on the x-axis or y-axis.  Example:  (4, 0) or (0,-2)
13.    Median = 3        Range = 8
         Mean = 4 ¹/₃    Mode = 2
14.    Examples:    x + y = 3        x - y = 3        2x + y = 6
15.    No.  When you plug 2 into the x value and 5 into the y value the equation equals -4 not -3.

.
20.  Sorry about the crookedness.

21.    C' = (-6, 4)    W' = (-2, 5)    H' = (-4,-3)
        Graph is below.

22.    C' = (-2, 4)    W' = (2, -5)    H' = (3, 6)
        Graph is below.  H' should be at (3,6) not (2,6) as it is in picture.  My fault.

23.    5 cm
24.    Y₁ = -3x + 17
25.    Circle the A, W, T, and Y
26.    Circle the C and X
27.    2
28.    3
29.    Slope of # 16 = -²/₃
         Slope of # 17 = 2
         Slope of # 18 = ¹/₂
         Slope of # 19 = 3