Which ordered pair in the form (a, b) is a solution of this equation?
7a – 5b = 28
a.
(4, 0)
b.
(0, 4)
c.
(–2, –3)
d.
(–3, –2)

the answer is b 1/10

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.