3. Section 1.3
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Hypothesis:&If... Conclusion:&then... Let's identify the hypothesis and conclusion of the given statement. Lines with the same slope are parallel. Now we can write the statement in if-then form. If two lines have the same slope, then they are parallel.
A vertical line has undefined slope. Now we can write the statement in if-then form. If a line is vertical, then it has an undefined slope.
The lines with slopes $ 23$ and $- 32$ are perpendicular. Now we can write the statement in if-then form. If two lines have slopes of $ 23$ and $- 32$, then they are perpendicular.