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anonymous

  • one year ago

7. The equation of a curve is xy=10 and the equation of a line l is 2x+y=q, where q is a number. (i) Find the set of values of q for which l does not intersect the curve. I am on the right track I think but I don't know how to get the answer. I will upload a picture of my working out but basically I got q<square root of 80 (which I incorrectly worked out to be 8.9 and used that but anyway).

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  1. anonymous
    • one year ago
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    and the actual answer is \[-\sqrt{80}<q<\sqrt{80}\]

  2. anonymous
    • one year ago
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    So basically I don't know why this is the answer or how to get it. Please help!

  3. anonymous
    • one year ago
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  4. anonymous
    • one year ago
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    The coordinates that I marked are from a previous question. But thats my working out

  5. zpupster
    • one year ago
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    yes that is correct https://www.desmos.com/calculator/m3ynz8wrtz

  6. anonymous
    • one year ago
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    So are you saying that their answer is just a different form of mine?

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spraguer (Moderator)
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