Kenneth S. answered 09/21/17
Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Use implicit differentiation to find the derivative formula (y' or dy/dx).
Substitute the x & y values of the stated point, to evaluate m = y' at said point.
Eq. of Tangent: y - y1 = m(x - x1)
calculate n = negative reciprocal of the above m;
Eq. of Normal: y - y1 = n(x - x1).
Can you do the implicit differentiation?