A jet plane is descending at a rate of 200 feet per second from an altitude of 36000 feet let x represent the number of seconds of descent and y represent the jet plane's altitude in feet.

Which expression represents this situation?

A. y = 200x - 36000

B. y = 200x + 36000

C. y = - 200x - 36000

D. y = - 200x + 36000

Question

Mathematics

Rene Moreno

30 March, 22:47

A jet plane is descending at a rate of 200 feet per second from an altitude of 36000 feet let x represent the number of seconds of descent and y represent the jet plane's altitude in feet.

Which expression represents this situation?

A. y = 200x - 36000

B. y = 200x + 36000

C. y = - 200x - 36000

D. y = - 200x + 36000

+3

Answers (2)

Know the Answer?

Janet Berger · Answer 1

Jane's plane will be modeled using linear equation given by:

y=ax+b

where:

a=slope=rate

b=y-intercept or initial valuegiven:

from the question

a=200 ft per second

b=36000 ft

thus the expression representing the situation will be:

y=200x+36000

where x is time in seconds

thus the answer is:

B. y = 200x + 36000

Donna Chambers · Answer 2

Rate of descend = 200 ft/sec

In x second, the plane will have descended by 200*x ft = 200x ft

The altitude of the plane, y after x seconds will be 36000 - 200x. That is,

y = 36000-200x = - 200x + 36000.

Therefore, the correct expression representing this situation is D.