Interpret the linear equation.The altitude above sea level of an airplane just after taking off from an airport on a high plateau is given by the linear function y = 400x + 2992, where y is in feet and x is the time in minutes since take-off. Find and interpret the slope and y-intercept.
A. m = 400; The minutes since take-off increases 400 for every foot of altitude. 
; The minutes that the plane takes to get to the altitude of the airport from sea level.
B. m = 2992; The minutes since take-off increases 2992 for every foot of altitude. 
The minutes that the plane takes to get to the altitude of the airport from sea level.
C. m = 400; The altitude of the airplane increases 400 feet every minute. b = 2992; The altitude of the airport where the airplane took-off is 2992 feet above sea level.
D. m = 2992; The altitude of the airplane increases 2992 feet every minute. b = 2992; The altitude of the airport where the airplane took-off is 400 feet above sea level.
Answer: C
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