Question

C.is decrease by 1 foot every 500 miles D. Is decrease by 1 foot every 1000 miles

Answer 1

Option A

Explanation:

Slope of a line passing through two points
`(x_1,y_1)` and
`(x_2,y_2)` is given by,

Slope =
`(y_2-y_1)/(x_2-x_1)`

Line shown in the graph is passing through two points (2, 8000) and (4, 7000).

Therefore, slope of the given line =
`(8000-7000)/(2-4)`

= -500 feet per mile

Which means, altitude decreases by 500 ft every mile.

(Negative sign represents the decrease)

Option A is the correct option.