An industrial machine can run at different speeds. The machine also produces defective items, and the number of defective items it produces appears to be related to the speed at which the machine is running. Statistical methods found that the equation y=0.73x-0.86 is able to give the approximate number of defective items, y , for a given machine speed, x . Use this equation to find the approximate number of defective items for a machine speed of 9 .

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