-2 (y + 3) – 6 (y – 10) = 42

1 Expand.

-2y-6-6y+60=42

2 Simplify  -2y-6-6y+60 to -8y+54.

-8y+54=2

3 Subtract 54 from both sides.

-8y=42−54

4 Simplify  42-54 to -12

-8y=-12

5 Divide both sides by -8.

y=-12/-8

6 Two negatives make a positive.

y=12/8

7 Simplify 12/8

y=3/2

or

y=1.5

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.