What is the slope of a line that is perpendicular to the line whose equation is 2x−y=7?

  -1/2

Step-by-step explanation:

Rearranging this equation to slope-intercept form, we see the slope (x-coefficient) is 2:

  2x = 7 + y . . . . . add y

  y = 2x -7 . . . . . . subtract 7

The slope of the perpendicular line is the opposite of the reciprocal of this:

  -1/2 = slope of perpendicular

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.