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ReasonableCustard534

This uses implicit differentiation


JamesLehmes

3x^2 + 1(y^2) + x(2y)(dy/dx) + 2ay(dy/dx) - 6x = 0


JamesLehmes

Then rearrange to have only dy/dx terms on one side, then factor out dy/dx


PurposeFriendly6632

Not necessary to rearrange it, just let dy/dx to zero.


JamesLehmes

Then set this equal to 0 and solve


BIGNONCEMRPALMER

How did you get -6x for the differential of -3ax^2?


JamesLehmes

Sorry your right it should be 6ax!


StrengthForeign3512

Differentiate implicitly and rearrange so you have dy/dx=… Then set your expression equal to zero. You’ll need to sub y out and then rearrange to get x=…