Alegrbra 1

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x and y vary inversely, and y = 3 when x = 6. Find y when x = 9.
A. 2
B. 4.5
C. 12
D. 18

  • Alegrbra 1 -

    if x and y vary inversely, then
    y = kx, where k is a constant

    using the given data
    3 = k(6)
    k = 1/2

    so y = x/2
    when x = 9, then y = 9/2 or 4.5

    or

    use an inverse ratio
    x1/y1 = x2/y2
    6/3 = 9/y
    6y = 27
    y = 27/6 = 9/2 = 4.5
    9y =

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