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Thread: How do you do this cooderinate geo question?

  1. #1
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    Question How do you do this cooderinate geo question?

    Snip20170928_1.png

    Just part b

    answer is -1:2 or 1:-2
    Not sure why, but when i do it, all my pro numerals get cancelled off leaving me with just numbers

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    Re: How do you do this cooderinate geo question?

    Let P(-7, 7) cut the interval AB in the ratio m:n.

    -7 = [(-2)n + 3m]/(m + n)
    -7(m + n) = -2n + 3m
    -7m - 7n = -2n + 3m
    -10m = 5n
    m/n = -5/10

    m/n = -1/2
    Therefore, the point cuts the interval in the ratio -1:2

    The reason why you only need to do it once is because you're finding the ratio between intervals, which can be rewritten in fractional form.
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    Re: How do you do this cooderinate geo question?

    Thank you!!!!

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