?Which of the following lines are perpendicular? Assume that each line moves indefinitely in both directions.
?
A. ?Line A containing the points: (-4, 3), (3, -4) ; Line B containing the points: (2, 6) and (3,7).
B. ?Line A containing the points: (-3,2), (3,0); Line B containing the points: (4,2) and (4,8).
C. ?Line A containing the points: (-2,-2), (0,-2); Line B containing the points: (3,5) and (3,-2).
D. ?a and c only
E. ?a and b only
Answer: D
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