1. Answers to Homework 2) -7, 8/3 6) (4,6)(12,10)(8,-2) NO (4,4)
2) -7, 8/3
6) (4,6)(12,10)(8,-2) NO (4,4)
8) (0,-4)(-4,-6)(-2,0) YES (-12,-6)
10) (0,-2)(-2,-3)(-1,0) NO (-24,-12)

2. 14-2 Reflections

3. Reflection: keeps size and shape, it’s on ISOMETRY
Reflection: keeps size and shape, it’s on ISOMETRY!!! (You don’t need to draw this) l k
Rk = reflect over line k
Rl = reflect over line l

4. Example
Original:
(3,4)
Rx-axis
Ry-axis
Ry = x
(3,-4)
(-3,4)
(4,3)

5. TOO Graph each original Find and graph the reflection across:
x-axis
y-axis
y = x
1) (-2,-3) 2) (4,1)
Answers:
1) (-2,3) (2,-3) (-3,-2)
2) (4,-1) (-4,1) (1,4)

6. Rules Look at the answers that you got for the example and the 2 TOO.
Write mappings for reflecting across:
x-axis (x stays the same!)
y-axis (y stays the same!)
y = x (they flip flop, signs STAY)
(x,y) → (x,-y)
(x,y) → (-x,y)
(x,y) → (y,x)

7. Homework
Page 580 #1-14