find the domain of y=f(x)

Question

A jet is traveling directly between Calgary Alberta and Portland Oregon which is 550 miles apart. If the jet is x miles away from Calgary and y miles from portland, find the domain of y=f(x)

Answer 1

x + y = 550

y = 550 - x

 

f(x) = 55 - x

 

Domain = {x | 0 ≤ x ≤ 500}