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## PowerPoint Slideshow about ' Deductive Reasoning' - effie

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Deductive Reasoning

- The process of reasoning logically from a given statement to a conclusion.
- Law of detachment – if a conditional’s hypothesis is true, then its conclusion is true
- If and p is true then so is q.

Example 1

- Suppose that a mechanic knows that if a car has a dead battery, the car will not start. A mechanic begins to work on a car and finds the battery is dead. What conclusion can she make?

Example 2

- Given: If M is the midpoint of a segment, then it divides the segment into two congruent segments.
- M is the midpoint of AB

Example 3

- If a baseball player is a pitcher, then that player should not pitch a complete game two days in a row. Vladimir Nunez is a pitcher. On Monday, he pitches a complete game. What can you conclude?

Example 4

- Does the following argument illustrate the Law of Detachment?
- Given: If it is snowing, then the temperature is less than or equal to 32. The temperature is 20.
- You conclude: It must be snowing.

Example 5

- If possible use the Law of Detachment to draw a conclusion. If it is not possible explain why.
- Given: If a road is icy, then driving conditions are hazardous. Driving conditions are hazardous.

Law of Syllogism

- Allows you to make conclusions about two different conditional statement when the conclusion of one is the hypothesis of the other.
- If and and p is true, we can use the Law of Syllogism to say that r is also true

Example 6

- If a number is prime, then it does not have any repeated factors.
- If a number does not have any repeated factors, then it is not prime.
- Draw a conclusion using the law of syllogism.

Example 7

- If a number ends in 0 it is divisible by 10
- If a number is divisible by 10, then it is divisible by 5.
- If possible, use the Law of Syllogism to draw a conclusion.

Example 8

- If a number ends in 6, then it is divisible by 2.
- If a number ends is 4, then it is divisible by 2.
- If possible use the Law of Syllogism to to make a conclusion.

Homework

- Pg 85 #1-21, 27-32

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