Homework Help: calculus

Posted by Jenny on Thursday, October 29, 2009 at 7:01pm.

Use implicit differentiation to find the slope of the tangent line to the curve (y/x+8y)=x^8 +9 at the point (1,10/-79).

calculus - Reiny, Thursday, October 29, 2009 at 7:29pm
I would rather use the product rule than the quotient rule, so lets multiply each term by x to get
y + 8xy = x^9 + 9x
dy/dx + 8x(dy/dx) + 8y = 9x^8 + 9
dy/dx(1+8x) = 9x^8 + 9 - 8y
dy/dx = (9x^8 + 9 - 8y)/(1+8x)

plug in your point and you are done.

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