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Two lines meet at 45° and one has slope 0. The other slope can be
A1 or –1
B0 or 2
C2 or –2
D√2 or –√2
Answer & Solution
Correct answer: A. 1 or –1
tan 45° = |m| / 1 gives |m| = 1, so m = 1 or –1.
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