Deductive reasoning  Logic
Deductive reasoning
Lessons
Notes:
Deductive Reasoning uses definitions, rules, and properties to see if a statement is true or false. There are two forms of deductive reasoning: Law of Detachment, and Law of Syllogism.
Law of Detachment states the following:
If $p\to q$ is true and $p$ is true, then $q$ must also be true
Law of Syllogism states the following:
If $p \to q$ and $q \to r$ are true, then $p \to r$ must be also true.

Intro Lesson
Deductive Reasoning Overview:

1.
Using the Law of Detachment
You are given the statements below. Assume these statements are true. Determine if a conclusion can be made by using the Law of Detachment. 
2.
Given the information and a statement below, determine if the conclusion is valid. Explain why it is valid or invalid.
If two lines are perpendicular, then they intersect 
3.
Using the Law of Syllogism
You are given the statements below. Assume these statements are true. Determine if a conclusion can be made by using the Law of Syllogism. 
4.
Given the information below, determine if the conclusion is valid. Explain why it is valid or invalid.