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Learn to identify hypotheses and conclusions in conditional statements, write statements, use counterexamples, and evaluate statements. Practice examples included.
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Objectives • Identify hypothesis and conclusion in a conditional statement • Write a conditional statement • Use counterexamples to prove a statement false • Evaluate if a statement is a counterexample
Vocabulary Conditional Statement If A, Then B
Vocabulary Hypothesis – The A Conclusion – The B
If the popcorn burns, Hypothesis
If the popcorn burns, then Hypothesis
If the popcorn burns, then the heat was too high. Hypothesis
If the popcorn burns, then the heat was too high. Hypothesis Conclusion
Example 1 Identify the hypothesis and conclusion of each statement. If 2x = 4, then x = 2 Hypothesis:
Example 1 Identify the hypothesis and conclusion of each statement. If 2x = 4, then x = 2 Hypothesis: 2x = 4 Conclusion:
Example 1 Identify the hypothesis and conclusion of each statement. If 2x = 4, then x = 2 Hypothesis: 2x = 4 Conclusion: x = 2
Example 1 Identify the hypothesis and conclusion of each statement. I eat light meals Rewrite as if-then:
Example 1 Identify the hypothesis and conclusion of each statement. I eat light meals Rewrite as if-then: If I eat, Then it will be a light meal
Example 1 Identify the hypothesis and conclusion of each statement. I eat light meals Hypothesis:
Example 1 Identify the hypothesis and conclusion of each statement. I eat light meals Hypothesis: I eat Conclusion:
Example 1 Identify the hypothesis and conclusion of each statement. I eat light meals Hypothesis: I eat Conclusion: light meals
Vocabulary Counterexample – A specific case in which a statement is proven false - It only takes ONE to prove a statement false
Example 4 Find a counterexample for the conditional statement. If you are using the Internet, then you own a computer. Assume the hypothesis is true.
Example 4 Find a counterexample for the conditional statement. If you are using the Internet, then you own a computer. Assume the hypothesis is true.
Example 4 Find a counterexample for the conditional statement. If you are using the Internet, then you own a computer. Assume the hypothesis is true. Will the conclusion always be true?
Example 4 Find a counterexample for the conditional statement. If you are using the Internet, then you own a computer. Assume the hypothesis is true. Will the conclusion always be true? No
Example 4 Find a counterexample for the conditional statement. If you are using the Internet, then you own a computer. Assume the hypothesis is true. Will the conclusion always be true? No - You could be using the Internet on a computer at school.
Example 4 Find a counterexample for the conditional statement. If Joe did not eat lunch, then he must be sick.
Example 4 Find a counterexample for the conditional statement. If the traffic light is red, then the car is stopped.
Example 4 Find a counterexample for the conditional statement. If the commutative property is true for multiplication, then it is true for division.
Example 4 Find a counterexample for the conditional statement. If x and y are whole numbers, then x – y ≠ y - x
Example 4 Find a counterexample for the conditional statement. If x ÷ y = 1, then x and y are whole numbers.
Example 4 Find a counterexample for the conditional statement. If you can read 8 pages in 30 minutes, then you can read any book in one day.
Example 4 Find a counterexample for the conditional statement. If x is any number , then x2 > x
Assignment Pg 40 18-29 (all) 36-45 (all)
