Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
4. Deductive Reasoning
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Exercise 21 Page 111

Use the Law of Detachment to make a conclusion between the statements A, and E. Then use Statement B to determine the truth value of the given statement.

Truth Value: may be true
Explanation: See solution.

Practice makes perfect

The following statements are given and we will assume that they are true.

  • A. If Maria is drinking juice, then it is breakfast time.
  • B. If it if lunchtime, then Kira is drinking milk and nothing else.
  • C. If it is mealtime, then Curtis is drinking water and nothing else.
  • D. If it is breakfast time, then Julio is drinking juice and nothing else.
  • E. Maria is drinking juice.
Let's make some conclusions to determine the truth value of the given statement. Since Statement E matches the hypothesis of Statement A, let's use the Law of Detachment to make a conclusion between Statement E and Statement A.

If p → q &is true and p &is true, then q &is true. Having used the Law of Detachment, we can make a valid conclusion. Conclusion I It is breakfast time. Now, we are ready to determine the truth value of the following statement. Statement Kira is drinking milk. Looking at Conclusion I and Statement B, we can say that the given statement may be true. We do not know what Kira drinks at breakfast so it may be milk.