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Slope Criteria for Parallel and Perpendicular Lines: Mastery Test
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Tools
in
Reasons
Statements
1. AČLED
AABC is similar to ACED
Given
Property of similar triangles
Definition of slope
slope of AC = -AB
siope of CD = 8
4. slope of AC x slope of CD = -8
5. slope of AC x slope of CD = -SE
6. slope of AC x slope of CD-1
EB Multiplying the slopes
E Substitution property of equality
Simplifying the right side
The table shows the proof of the relationship between the slopes of two perpendicular lines. What is the missing statement in step 22