Write in function form
5x + 4y = 20.

Step-by-step explanation:

5x + 4y = 20

You need to express y in terms of x.

isolate the y term

4y = -5x + 20

divide both sides by the coefficient of y

y = (-5/4)x + 5

f(x) = (-5/4)x + 5

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.