Finding the graph of an equation  TOPIC_SOLVED

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Finding the graph of an equation

Postby Luke53 on Thu Nov 28, 2013 2:57 pm

How can I graph the following equation?
x^3 * y^2 = x * y^3 + 6
I don't know how to isolate y (to get y as a function of x).
Thanks.
Luke.
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Re: Finding the graph of an equation

Postby nona.m.nona on Thu Nov 28, 2013 6:16 pm

Luke53 wrote:How can I graph the following equation?
x^3 * y^2 = x * y^3 + 6
I don't know how to isolate y (to get y as a function of x).

The solution process would likely require the process (rather complex) for finding the roots of cubic polynomials. Are you required to graph this, or are you being asked for solutions, or some other task?
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Re: Finding the graph of an equation

Postby Luke53 on Thu Nov 28, 2013 7:50 pm

If I could graph this equation, I would be able to see what points (x,y) are on this graph, so then I could derive the slopes of the tangent lines at several of these points. One solution is (2,1) so this surely is one point on the graph and the slope of the tangent line here is -(11/10) (after implicit differentiation). So how can I find other points that are part of this graph if I can't plot it out ? Probably it would be possible to find some points where the tangent lines are horizontal or vertical, but what about other points on this graph?
Thanks for your answer.
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Re: Finding the graph of an equation

Postby nona.m.nona on Thu Nov 28, 2013 10:38 pm

Luke53 wrote:If I could graph this equation, I would be able to see what points (x,y) are on this graph, so then I could derive the slopes of the tangent lines at several of these points.

You enquired regarding solving the original equation for y in terms of x. Now you mention graphing, differentiating, finding tangent lines, etc. Kindly please furnish the text of the exercise, as this should serve to clarify what is needing to be done. Thank you.
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Re: Finding the graph of an equation  TOPIC_SOLVED

Postby nona.m.nona on Thu Nov 28, 2013 10:39 pm

As an aside, further information, including a portion of the graph, may be viewed at the following link:

http://www.wolframalpha.com/input/?i=x^3+y^2+%3D+x+y^3+%2B+6

This forum's scripting seems to "break" the link, so it may be required that one copy the above and paste the entire line into the browser's location bar.
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Re: Finding the graph of an equation

Postby Luke53 on Fri Nov 29, 2013 9:07 am

Thanks for your hint and showing me the solution on the Wolfram website.
Part of the implicit plot is shown there.
This plot is what I was after.
How can I get this same plot on my graphic calculator (if this is possible)?
Thanks for the answer.
Luke.
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Re: Finding the graph of an equation

Postby little_dragon on Fri Nov 29, 2013 11:14 am

graphing calcs only do y= so i dont think U can
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