1. Answers to Homework 2a) -2/5 b) -2/5 c) 5/2 4) 1,1,-1,-1 6a) -1,1 b) Multiply to -1 c) If one angle of a parallelogram is right, all angles are d) (3,-1) 8) 7/2,-2/7 -2/5,5/2 -3,1/3

2. 13-5 The Midpoint Formula Answers to Warm Ups 1a) 2 b&c) 0 d) Undefined 2a) 10√2 b&c) -1 d) 1 3a) √29 b&c) -5/2 d) 2/5

3. Midpoint Formula Example: (-2,2) (6,4)

4. TOO 1) (-3,7) (-7,-5) 2) (-1,-3) (-3,6) 3) (t,2) (t+4,-4) Answers: 1) (-5,1) 2) (-2,3/2) 3) (t+2,-1)

5. Working Backwards Example Endpoint: (-2,7) Midpoint: (3,2) Find the other end point (x,y)

6. TOO 1) E: (4,-2) M: (0,-5) 2) E: (2,10) M: (-1/2,4) 3) E: (2b,3) M: (b+2,-1) Answers: 1) (-4,-8) 2) (-3,-2) 3) (4,-5)

7. Homework Page 545 #1-12 – Make sure to read the directions