Analyzing Conditional Statements A _______________________________ is a logical statement that has two parts, a hypothesis and a conclusion.

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Analyzing Conditional Statements A _______________________________ is a logical statement that has two parts, a hypothesis and a conclusion.

EXAMPLE 1 Rewrite a statement in if-then form Rewrite the conditional statement in if-then form. All birds have feathers. a. b. Two angles are supplementary if they are a linear pair. SOLUTION First, identify the hypothesis and the conclusion. When you rewrite the statement in if-then form, you may need to reword the hypothesis or conclusion. a. All birds have feathers. If an animal is a bird, then it has feathers.

EXAMPLE 1 Rewrite a statement in if-then form b. Two angles are supplementary if they are a linear pair. If two angles are a linear pair, then they are supplementary.

GUIDED PRACTICE for Example 1 Rewrite the conditional statement in if-then form. 1. All 90 ° angles are right angles. ANSWER If the measure of an angle is 90 °, then it is a right angle 2.2x + 7 = 1, because x = –3 ANSWER If x = –3, then 2x + 7 = 1

GUIDED PRACTICE for Example 1 Rewrite the conditional statement in if-then form. 3. When n = 9, n 2 = 81. ANSWER If n = 9, then n 2 = Tourists at the Alamo are in Texas. ANSWER If tourists are at the Alamo, then they are in Texas.

T The ball is not red The cat is black

Conditional statements Converse Switch the hypothesis and the conclusion Inverse Negate the hypothesis and the conclusion Contrapositive Switch and negate the hypothesis and conclusion Biconditional Contains the phrase “if and only if”

EXAMPLE 2 Write four related conditional statements Write the if-then form, the converse, the inverse, and the contrapositive of the conditional statement “Guitar players are musicians.” Decide whether each statement is true or false. SOLUTION If-then form: If you are a guitar player, then you are a musician. Converse: If you are a musician, then you are a guitar player. True, guitars players are musicians. False, not all musicians play the guitar.

EXAMPLE 2 Write four related conditional statements Inverse: If you are not a guitar player, then you are not a musician. Contrapositive: If you are not a musician, then you are not a guitar player. False, even if you don’t play a guitar, you can still be a musician. True, a person who is not a musician cannot be a guitar player.

GUIDED PRACTICE for Example 2 5. If a dog is a Great Dane, then it is large Write the converse, the inverse, and the contrapositive of the conditional statement. Tell whether each statement is true or false. Converse: If the dog is large, then it is a Great Dane, False Inverse: If dog is not a Great Dane, then it is not large, False ANSWER Contrapositive: If a dog is not large, then it is not a Great Dane, True

**Every definition can be written as a conditional statement in if-then form or as its converse. Both statements will be true.** Definition – If two lines intersect to form a right angle, then they are perpendicular. Converse – If two lines are perpendicular, then they intersect to form a right angle. Biconditional – Two lines intersect to form a right angle if and only if they are perpendicular.

Example 5 Rewrite the statement as a biconditional If Mary is in theater class, then she is in the fall play If Mary is in the fall play, then she is in theater class. Biconditional Mary is in theater class if and only if she is in the fall play.