Plz I need this answer now. Y= -x constant of proportionality

-1

Step-by-step explanation:

y = -x = (-1)x is a linear, proportional relationship.

Compare y = (-1)x to y = kx.  We see that the constant of proportionality, k, must be -1.

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.

5+2x=a

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