x/y + 9 = n for y

Discussion in 'Calculator Requests' started by math_celebrity, Oct 26, 2021.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    x/y + 9 = n for y

    First, subtract 9 from each side to isolate the y term:
    x/y + 9 - 9 = n - 9

    Cancel the 9's on the left side, and we get:
    x/y = n - 9

    Cross multiply:
    x = y(n - 9)

    Divide each side by (n - 9):
    x/(n - 9) = y(n - 9)/(n - 9)

    Cancel the (n - 9) on the right side, and we get:
    y = x/(n - 9)
     

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