Which of these systems of linear equations has an infinite number of solutions?

A. 3x-8y=21
6x-16y=46

B. 3x+6y=22
6x+12y=44

C. 5x+9y=2-
10x-14y=48

D. 5x-9y=20
10x+18y=40

Respuesta :

Answer:  3x+6y=22

6x+12y=44

Step-by-step explanation: my math teacher told me

3x+6y=22 and 6x+12y=44 system of linear equations have an infinite number of solutions.

When will a system of equations have an infinite number of solutions?

A system of linear equations will have an infinite number of solutions when the equations are the same. That is, when the equations coincide.

We can find which system of equations have infinite number of solutions as shown below:

Let's take the system,

3x-8y=21

6x-16y=46

Divide the second equation throughout by 2:

We get 3x-8y=23, This is not the same as the first equation. This system does not have infinitely many solutions.

Let's take the system,

3x+6y=22

6x+12y=44

Divide the second equation throughout by 2:

We get 3x+6y=22, This is the same as the first equation. This system has infinitely many solutions.

Let's take the system,

5x+9y=2

10x-14y=48

Divide the second equation throughout by 2:

We get 5x-7y=24, This is not the same as the first equation. This system does not have infinitely many solutions.

Let's take the system,

5x-9y=20

10x+18y=40

Divide the second equation throughout by 2:

We get 5x+9y=20, This is not the same as the first equation. This system does not have infinitely many solutions.

Therefore, we have found the system of equations contained in option B has infinitely many solutions.

Learn more about the system of linear equations here: https://brainly.com/question/847634

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