Given the system of equations presented here:
2x + 4y = 14
4x + y = 20
Which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated?
A. Multiply the second equation by −4 to get −16x − 4y = −80
B.Multiply the second equation by −1 to get −4x − y = −20
C.Multiply the first equation by 2 to get 4x + 8y = 28
D.Multiply the first equation by −1 to get −2x − 4y = −14

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- anonymous

- katieb

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- Mehek14

Multiply the first equation by 2
so when you subtract 4x - 4x
x is eliminated

- anonymous

ok Can you show me step by step i am really confused.

- Mehek14

when you multiply
2x + 4y = 14
by 2 you get
4x + 8y = 28

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## More answers

- Mehek14

now you have
4x + 8y = 28
4x + y = 20

- anonymous

|dw:1437495005459:dw|

- Mehek14

If you subtract
\(~4x+8y=28\\ -4x+y=20\\------ \\ 0x + 7y = 8\)

- Mehek14

so you have eliminated x

- anonymous

Ok.

- anonymous

Is it A?

- anonymous

@Mehek14 ??

- Mehek14

C

- anonymous

Oh. OK Thank you!

- Mehek14

your welcome

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