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n1995

  • 3 years ago

To solve this system using the addition method, you would need to multiply the first equation by what number in order for the y's to add out? 3x - y = 3 -2x + 2y = 6

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  1. joshi
    • 3 years ago
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    well you need the same coefficient for y if you want them to cancel. in the first one the coefficient of y is -1. and in the second it's 2. so -1 x ? = 2

  2. n1995
    • 3 years ago
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    -1 x -1 = 2 ?

  3. radar
    • 3 years ago
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    You would the first equation by 2, getting 6x -2y = 6. when added to second equation the y's would "add out" or their sum is 0.

  4. radar
    • 3 years ago
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    I left out the word multiply, which goes in the first sentence between " would * the"

  5. n1995
    • 3 years ago
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    so what would you multiply the eqaution by?

  6. Dido525
    • 3 years ago
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    @hero. Don't just post the answer next time unless you absolutely need to...

  7. Hero
    • 3 years ago
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    I thought I was checking someone's answer. @Falkqwer misled me

  8. Dido525
    • 3 years ago
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    Ohh...

  9. Falkqwer
    • 3 years ago
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    Yes he did :)

  10. Falkqwer
    • 3 years ago
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    lol I did

  11. radar
    • 3 years ago
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    As I have previously posted, if you want to eliminate the y's, multiply the first equation by 2. this gives you: 6x -2y = 6 Now add the 2nd equation -2x+2y =6 --------------- 4x = 12 x=3

  12. radar
    • 3 years ago
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    Now you can solve for y.

  13. Hero
    • 3 years ago
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    There can only be one right answer

  14. Falkqwer
    • 3 years ago
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    @radar is right cause your supposed to Solve it using the addition method.

  15. radar
    • 3 years ago
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    Substituting for x in the 2nd equation getting -2(3) + 2y = 6 -6 +2y = 6 2y= 12 y=6 x=3, y=6 To be sure check them out

  16. Hero
    • 3 years ago
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    I found my mistake. Wha ta shame

  17. radar
    • 3 years ago
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    Do we need to verify? Did you get (3,6) @Hero

  18. Hero
    • 3 years ago
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    @radar, what is it about "I found my MISTAKE" did you not understand?

  19. radar
    • 3 years ago
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    It never hurts to verify substituting 3 for x, 6 for y 3x-y=3 or 3(3)-6=3 9-6=3 3=3 first one checks! -2x+2y=6 -2(3)+2(6)=6 -6 +12 = 6 6=6 checks

  20. Hero
    • 3 years ago
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    No need to persist. Be happy that you provided the right solution and move on.

  21. radar
    • 3 years ago
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    @Hero, just wanted to verify my answer, so I was simply asking if you got the same (after your error discovery.

  22. Hero
    • 3 years ago
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    When I said I found my mistake, that implies that I acknowledge your correct answer. Furthermore I gave you a medal. As I said, no need to persist beyond that.

  23. radar
    • 3 years ago
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    Thanks @Hero

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