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Homework Help: Points of tangency

  1. Nov 17, 2004 #1
    I have the following function given, and I need to find the points of tangency...
    Two tangent lines to the huperbola [tex] 9x^2 - y^2 =36 [/tex] interesect at the y-axis.

    Use implicit differentiation to find the points of tangency.

    Ok so i multiplied both sides by dy/dx, and solved for y'...i got
    [tex]y'= \frac {9x}{y}[/tex]
    so to find the points of tangency, do i plug in the x and y values? im a little confused on that...thanks.
  2. jcsd
  3. Nov 17, 2004 #2
    Can anyone help?
  4. Nov 17, 2004 #3
    anyone at all???
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