An Airplane Has Room for 300 Coach-Fare Seats $x$ Coach-Fare Seats And

Short Answer

An airplane has room for 300 coach-fare seats. It can replace any 3 coach-fare seats with 2 first-class seats. Suppose the airplane is configured with $x$ coach-fare seats and $y$ first-class seats, with no space wasted. If $y=b+m x$ , then $b=―――$ and $m=―――$