Find X-coordinate and determine whether it is a min/max/neither

kirsten

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May 7, 2013
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Consider the differential equation dy/dx = (3-x) / y

Let y= f(x) be the particular solution to the given differential equation for 1 < x < 5 such that the line y = -2 is tangent to the graph of f. Find the x-coordinate of the point of tangency, and determine whether f has a local maximum, minimum, or neither at this point. Justify your answer.

I was able to find the coordinate (x= 3) because the slope is equal to 0 at the point of the tangecy 3-3/y = 0, but I am unsure of how to find whether it is a min/max/neither. It'd be great if someone could help me understand how to do this!
 
Consider the differential equation dy/dx = (3-x) / y

Let y= f(x) be the particular solution to the given differential equation for 1 < x < 5 such that the line y = -2 is tangent to the graph of f. Find the x-coordinate of the point of tangency, and determine whether f has a local maximum, minimum, or neither at this point. Justify your answer.

I was able to find the coordinate (x= 3) because the slope is equal to 0 at the point of the tangecy 3-3/y = 0, but I am unsure of how to find whether it is a min/max/neither. It'd be great if someone could help me understand how to do this!
f' = dy/dx = (3-x) / y
what is f''(3) ?
 
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