Question

Consider the following system of equations:

2x + 2y = -4
x - 4y = 2

Which shoices could you use to start solving the system? Choose all that apply.

Multiply the second equation by -2 and add the two equations.
Divide the first equation by 2 and add the equations.
Multiply the first equation by 2 and add the equations.
Multiply both equations by 2 and add the equations.
Divide the first equation by -2 and add the equations.

Please answer quick

Answer 1

Answer: B, E

Explanation:

Answer 2

1 3 and 5

Explanation:

The first choice definitely works.

2x + 2y = -4

-2x+8y = -4

If you add these two, you will be solving for y.

The second choice does not work.

If you subtracted, it would work, but that is not the way it is written.

The third choice works. You will be solving for x

4x + 4y = - 8

x - 4y = 2

The y's cancel and you are solving for x

The 4th choice gains nothing. Nothing can be eliminated.

The 5th choice works. You will get rid of the xs and solve for y.

-x - y = 2

x - 4y = 2

Adding gets rid of the xs and you will be solving for y.