The equation of a common tangent to the curves y2 = 16x and xy = -4, i

1.	The equation of a common tangent to the curves y2 = 16x and xy = -4, is:
A.	x – y + 4 = 0
B.	x + y + 4 = 0
C.	x – 2y + 16 = 0
D.	2x – y + 2 = 0
Answer» B. x + y + 4 = 0

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