Drew gets a weekly allowance of $15, and he spends it as shown in the table. How much is left for his savings account each week?

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

its a straight line parallel to the time axis