Answer:
Equation is [tex]c=\frac{s}{2}[/tex]
Step-by-step explanation:
Number of seats = 200
Cost of building a airplane with 200 seats = 100 million
As cost of dollars,c, is proportional to the number of seats,s,
[tex]c=ks[/tex] where k is any constant.
Put [tex]s=200\,,\,c=100[/tex]
[tex]100=200k\\k=\frac{100}{200}\\ k=\frac{1}{2}[/tex]
Now put [tex]k=\frac{1}{2}[/tex] in [tex]c=ks[/tex]
So, the equation which can be used to determine the cost,in millions of dollars to build an airplane with any number of seats is [tex]c=\frac{s}{2}[/tex]
