X= y2 - 1
2x - y = 4
which of the following equations could be the result of using substitution to solve the system?
2y² - y - 5 = 0
2y² - y - 6 = 0
2y² - 2y - 5 = 0

Option (2) is correct.

Step-by-step explanation:

Given two equations and

We have to choose an equation from the given options which could be the result of using substitution to solve the system.

Since the given equation is in term of y , so we make substitution of x in term of y.

From ,

⇒

Substitute    in other equation

We get,

Cross multiply we get,

Solving further, we get

Thus, option (2) is correct.

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.