. If the tangent to the curve
xy+ax+by=0 at (1, 1) is inclined at an angle tan-12 with the x-axis, then
A. a = 1, b = 2
B. a = 1, b = –2
C. a = –1, b = 2
D. a = –1, b = –2
Best Answer
Ans: B
Sol: The point (1, 1) lies on the curve xy + ax + by = 0
a+b=-1
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