alleryFind dy/dx by implicit differentiation for x² + y² = 25:
Ax/y
B-x/y
C2x
Dy/x
Answer & Solution
Correct answer: B. -x/y
**Differentiate both sides:** 2x + 2y(dy/dx) = 0. So dy/dx = -x/y.
(This is the slope of a circle of radius 5; tangent perpendicular to radius.)
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