Answer:
The answer is "2x-y=4"
Step-by-step explanation:
Given:

The Formula of Slope:

by replacing the (2,0) and (0,-4) coordinates in the above formula:

if point y intercepting in x then x=0, for this the value of x= 0 and c=-4.
Equation of the line:

apply m and c value in the above equation:

Subtract by 2x on both sides of the equation we get:

The domain is [-2/3,infinity) U (infinity,-2/3]
3+4=7
7 x 8=56
There will be 56 airplanes :)Hope this helped!