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anonymous

  • one year ago

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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  1. Mehek14
    • one year ago
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    Multiply the first equation by 2 so when you subtract 4x - 4x x is eliminated

  2. anonymous
    • one year ago
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    ok Can you show me step by step i am really confused.

  3. Mehek14
    • one year ago
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    when you multiply 2x + 4y = 14 by 2 you get 4x + 8y = 28

  4. Mehek14
    • one year ago
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    now you have 4x + 8y = 28 4x + y = 20

  5. anonymous
    • one year ago
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    |dw:1437495005459:dw|

  6. Mehek14
    • one year ago
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    If you subtract \(~4x+8y=28\\ -4x+y=20\\------ \\ 0x + 7y = 8\)

  7. Mehek14
    • one year ago
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    so you have eliminated x

  8. anonymous
    • one year ago
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    Ok.

  9. anonymous
    • one year ago
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    Is it A?

  10. anonymous
    • one year ago
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    @Mehek14 ??

  11. Mehek14
    • one year ago
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    C

  12. anonymous
    • one year ago
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    Oh. OK Thank you!

  13. Mehek14
    • one year ago
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    your welcome

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