Multiple Choice
Find the points at which the curve + 6xy + 5
= 80 has horizontal tangent lines.
A) (3, -5) and (-3, 5)
B) (3, 5) , (5, -3) , (-3, 5) , and (-5, -3)
C) (5, -3) and (-5, 3)
D) (3, 5) , (3, -5) , (-3, 5) , and (-3, -5)
E) The curve does not have horizontal tangent lines.
Correct Answer:

Verified
Correct Answer:
Verified
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