Math

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I have been stuck on this problem for a while need help on it and soon. It's functions.

X Rule Y

10 65
30 45
50 25
70 5
I can't find the rule

  • Math -

    Did you not notice that for every increase of 20 in the x's there is a decrease of 20 in the y's
    so the slope is (45-65)/(30-10) = -1

    so y = -x + b
    using x=10, y = 65
    65 = -10 + b
    b = 75

    y = -x + 75

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