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**skboss** If the derivative *dx*/*dy* exists at a point and *dx*/*dy* = 0, then the tangent line is vertical. Use this information and the given equation to answer the following questions-

*y*4 + 5 = *y*2 + *x*2

1) Find dx/dy

Ans: *y*4 + 5 = *y*2 + *x*2

*4y*3 =2 *y* + 2*x* dx/dy

(*4y*3 -2 *y*)/ 2*x* = dx/dy

2) Find the points on the graph where the tangent line is vertical. Arrange the values from smallest to largest.

How do I do this one? Some one please help me with this.

(P.S.-please show the step so I will understand)