The proof is in the pudding Indubitably Le

“The proof is in the pudding. ” “Indubitably. ” Le pompt de pompt le solve de crime!" Je solve le crime. Pompt de pompt. " Deductive Reasoning 2 -1 Written Ex. P 35.

2 -1 Written Ex. P 34. Underline the hypothesis and box the conclusion. 1. If 3 x – 7 = 32, then x = 13. 2. I can’t sleep if I am tired. 3. I’ll try if you will.

Underline the hypothesis and box the conclusion. 4. If , then 5. a + b = a implies b = 0. 6. x = - 5 only if x 2 = 25. is a right angle.

Rewrite each pair of conditionals as a biconditional. 7. If B is between A and C, then AB + BC = AC. If AB + BC = AC, then B is between A and C if and only if AB + BC = AC 8. If If , then is a straight angle, then. if and only if is a straight angle.

Write each biconditional as a pair of conditionals. 9. Points are collinear if and only if they all lie in one line. If points are collinear, then they all lie in one line. If all points lie in one line, then they are collinear. 10. Points lie in on plane if and only if they are coplanar. If points lie in on plane, then they are coplanar. If points are coplanar, then they lie in on plane.

Provide a counter example to show that each statement is false. When trying these algebraic us negative numbers , 1, 0, 1, 10, and fractions between 0 and 1 as test values. Let a = 1 and b = -1 (-1)(1) < 0 and a > 0 11. If ab < 0 , then a < 0. 12. If n 2 = 5 n , then n = 5. 13. If point G is on n=0 n 2 = 5 n but n is not = 5 , then G is on A B G .

Provide a counter example to show that each statement is false. 14. If xy > 5 y , then x > 5. Let x = - 1 and y = -1 (-1) > 5(-1) 1 > -5 But – 1 is not > 5 15. If a four-sided figure has 4 right angles, then it has four congruent sides. A rectangle. 15. If a four-sided figure has four congruent sides, then it has 4 right angles. Diamond or rhombus.

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 17. If x = - 6, then If . True , then x = - 6. False x could = + 6

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 18. If , then x = - 2. False x could = + 2 Quadratic equations have 2 roots. 18. If x = - 2 , then True .

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 19. If b > 4 , then 5 b > 20. True If 5 b > 20, then b > 4. True

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 20. If , then is not obtuse. True If is not obtuse, then . False T could = 90, 80, . .

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 21. If Pam lives in Chicago, then she lives in Illinois. True If Pam lives in Illinois, then she lives in Chicago. False, there a lot of other cities in Illinois.

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 22. If , then . True: all definitions are reversible.

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 23. if . True 23. If , then . False a could be -10.

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 24. x=1 only if . True If Note “only if” is not the same as “if”. Only if means “then” then x = 1. False x could be 0.

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. Note “only if” is not 25. n > 5 only if n > 7. the same as “if”. Only if means “then” False n could be 6. If n > 7 , then n > 5. True

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 26. ab = 0 implies that a = 0 or b = 0. True a = 0 or b = 0 implies that ab = 0. True

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 27. If points D, E, and F are collinear, then DE + EF = DF. False Counterexample D F E E If DE + EF = DF, then points D, E, and F are collinear. False Counterexample D F

Tell whether each statement is true or false. Then write the converse and tell whether the converse is true of false. 28. P is the midpoint of that GH = 2 PG. implies True GH = 2 PG. implies that P is the midpoint of False P 1 Counterexample G 2 H

29. Write a definition of congruent angles as a biconditional. 30. Write a definition of a right angle as a biconditional. is a right angle if and only if

C’est fini. Good day and good luck.