tmagloire1
  • tmagloire1
AP Calculus AB Help!!! please help me on these two questions 1.For the curve given by 4x^2+y^2=48+2xy find the positive y-coordinate given that the x-coordinate is 2. 2.For the curve given by 4x^2+y^2=48+2xy show that there is a point P with x-coordinate 2 at which the line tangent to the curve at P is horizontal.
Mathematics
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SOLVED
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chestercat
  • chestercat
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tkhunny
  • tkhunny
Have you considered substituting x = 2 and solving for y?
tmagloire1
  • tmagloire1
Is it that simple? I thought I might have to differentiate implicitly but i wasn't really sure where to start.
tmagloire1
  • tmagloire1
Would plugging in x=2 work? or should i do the latter

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tmagloire1
  • tmagloire1
anyone?
tkhunny
  • tkhunny
No differentiation. There is no such thing as "plugging in". Try substitution.

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