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Slope Criteria for Parallel and Perpendicular Lines: Mastery Test
Prove: siope OT AC X slope or DC
Reasons
Statements
1. ACID
AABC is similar to ACED
Given
Property of similar triangles
Definition of slope
3. slope of AC = -2
slope of CD = Ep
4. slope of Ãc x slope of CD =
5. slope of AC x slope of CD =
6. Slope of AC x slope of CD = -1
2 x Multiplying the slopes
SE 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 2?
A = BE
B. AD SE
c. ABC
D. ABER
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