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Solmyr

  • 3 years ago

If you wanted to eliminate the y variable by adding the two equations in the following system, what could be your first step? 2x − 4y = 6 3x − y = 12 Add the two equations together Multiply the first equation by −4 Multiply the second equation by −4 Multiply the second equation by 4

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  1. inkyvoyd
    • 3 years ago
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    Well, what are you having trouble with?

  2. Solmyr
    • 3 years ago
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    wat to do first

  3. inkyvoyd
    • 3 years ago
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    Well, you want to make it so if you add the two equations y disappears...

  4. Solmyr
    • 3 years ago
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    B then??

  5. inkyvoyd
    • 3 years ago
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    No. why would you try B?

  6. Solmyr
    • 3 years ago
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    nvm

  7. Solmyr
    • 3 years ago
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    i just relized wat i did wrong

  8. Solmyr
    • 3 years ago
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    so going off of wat u said i need to add them first or i need to get rid of the Y's first

  9. inkyvoyd
    • 3 years ago
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    You need to multiply one equation by a constant, and then add them. You want to make it so that the constant you mutiply by cancels out the y value when you add them.

  10. Solmyr
    • 3 years ago
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    ok

  11. Solmyr
    • 3 years ago
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    would it be D because mulitply 4 * 1 its going to be 4 and when you and 4 and -4 together it cancels each other out leaving the y-intercept out of the equation

  12. inkyvoyd
    • 3 years ago
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    careful - if you multiply by 4 when you add them you actually get -8y. You'll want to multiply the second equation by -4 actually.

  13. Solmyr
    • 3 years ago
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    oh ok

  14. Solmyr
    • 3 years ago
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    so C

  15. inkyvoyd
    • 3 years ago
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    yup.

  16. Solmyr
    • 3 years ago
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    ok thnk u for the help

  17. inkyvoyd
    • 3 years ago
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    You're welcome :)

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