Question

I had “y=30000x-850” which I honk was wrong so I need help :/

Answer 1

For the given equation, we use slope intercept form, which is

$y = mx +b$

Where y is the height, m is the rate and b is the initial height.

Substituting the given values, we will get

$y = -850x + 30000$

Part b

Here we put x=8

$y= -850(8)+30000 = 23200feet$

Answer 2

A plane was flying at an altitude of 30,000 feet when it began its descent toward the airport. The plane descends at a rate of 850 feet per minute.

Write a function rule that describes this situation

Answer: Let S be the altitude (in feet).

We know that plane's altitude is decreasing at the of 850 feet per minute from the initial altitude 30,000 feet.

$S=30,000-850 \times t$

Where t is the time in minutes

b) What is the altitude of the plane after it has descended for 8 min?

Answer: After 8 minutes plane's altitude is

$S=30,000-850 \times 8$

          =$30,000-6800$

          $=23200$ feet