Two lines are perpendicular when their slopes:
AMultiply to minus two
BMultiply to minus four
CMultiply to minus nine
DMultiply to minus one
Answer & Solution
Correct answer: D. Multiply to minus one
1. Perpendicularity is a condition on the two slopes.
2. It is stated as a product.
3. Two lines are perpendicular if the product of the two slopes is minus one.
4. So the answer is multiply to minus one.
_Source: OpenStax 'Algebra and Trigonometry 2e', 2.1 'The Rectangular Coordinate Systems and Graphs'_
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