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`        If x + y = k is normal to y2 = 12 x, then k is : (A) 3                                        (B) 9 (C) –9                                      (D) –3`
8 years ago

Ramesh V
70 Points
```										slope of parabola at any point is :
dy/dx = 12/2y
slope of line is -1,
as line is normal, (-1)*(12/2y) = -1
y = 6 and so x is 3
so eqn of line is x+y=9
--
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```
8 years ago
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