Does the table represent a function? Why or why not?

Please help ASAP!

14 pointslet x be the seats in the small van and y the seats in the large van. how many seats does the large van have? a company uses two vans to transport worker from a free parking lot to the workplace between 7: 00 and 9: 00a.m. one van has 9 more seats than the other. the smaller van makes two trips every morning while the larger one makes only one trip. the two vans can transport 69 people, maximum.how many seats does the larger van have?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

What is the rate for one gallon of gasoline