Question: 33. Write an equation relating x, y and z given that z varies jointly with x and y and z = 20 when x =

33. Write an equation relating x, y and z given
33. Write an equation relating x, y and z given that z varies jointly with x and y and z = 20 when x = -3 and y = 4. Then find z when x = 8 and y = 9

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