If x/y = 3/z then 9y^2 equals
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x/y = 3/z
xz = 3y
take square both sides
(xz)^2 = 9y^2
9y^2 = x^2y^2
xz = 3y
take square both sides
(xz)^2 = 9y^2
9y^2 = x^2y^2
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