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z varies directly with x and inversely with y hence we can write
z = kx/y ; where k is the constant of variation it is given that when x = 6 and y = 2, z = 15.
z varies jointly with x and y.
z = kx/y
15 = (6/2)k
15 = 3k
hence the relation becomes z = 5x/y
Now we need to find z = ? when x = 4 & y = 9
hence z = 5 * 4 * 9 =180 Answer
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Jun 30th, 2015
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