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The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

Which point is a solution to y s 4x + 5?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no