The point (2, 1) is a solution to which of the following systems of equations? O 2x + y = 5 and -2x + y = 2
O-2x - y = -5 and 2x - y = 2
O -x + y = 3 and -3x + y = -5
O x + y = 3 and 3x - y = 5

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step-by-step explanation:

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54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

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step-by-step explanation: