Question: Calculus Implicit Differentiation I'm trying to find an equation for the line tangent to the graph of ln y + x3 + 2xy = 10

Calculus Implicit Differentiation

I'm trying to find an equation for the line tangent to the graph of ln y + x3 + 2xy = 10 at the point(2, 1) for a practice exam. Using Implicit Differentiation, I get a slope of -14/5. The solutions section says the slope should be -16/5. I believe the reason for this is that whoever created the solutions page accidentally plugged in 2 for y in the numerator after find what dy/dx equaled. Am I correct or am I missing something?

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