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.

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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.