College Algebra / Unit 7 Alg 393 short lesson, about 20 seconds
Joint Variation
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The idea
A quantity varies jointly with two others when it varies directly with their product: z = kxy.
In practice
If z = 36 when x = 3 and y = 2, then k = 36/6 = 6, and at x = 1, y = 5 the value is z = 30.
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