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August 29, 2015

Homework Help: Calculus

Posted by George on Friday, November 7, 2008 at 12:43am.

(A) Find the equations of the tangent lines to the circle x^2 +y^2=25 at the points where x=4.
(B) Find the equations of the normal lines to this circle at the same points. (The normal line is perpendicular to the tangent line at that point.)
(C) At what point do the two normal lines intersect?


For part A, I found that
16 + y 2= 25
y 2= 9
y=3
y=3/4x
For part B,I'm not sure whether it is y=-4/3x
For part C Not sure how to do it.

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