Mathematics, 02.04.2020 02:39 norahfrost

Z is jointly proportional to x^2 and y^2. If z=379 when x=7 and y=5, find z when x=6 and y=4

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Z is jointly proportional to x^2 and y^2. If z=379 when x=7 and y=5, find z when x=6 and y=4...