Question

Write the equation of the line that is tangent to the circle x^2 + y^2 = 100 at the point (8, 6).

Answer 1

differentiate the equation of the circle with respect to x
and find dy/dx at (8,6) which is slope m.
then find the equation
by y-y1=(-1/m)(x-x1)
where (x1,y1)=(8,6)