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anonymous

  • 5 years ago

solve by elimination 6x+2y=-28 6x-2y=-44

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  1. anonymous
    • 5 years ago
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    tina... if you add straight down.. what do you get.

  2. anonymous
    • 5 years ago
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    12x 4y -72

  3. anonymous
    • 5 years ago
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    almost. 12x then the y's cancel because 2y - 2y = 0 12x = -72

  4. anonymous
    • 5 years ago
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    ok wasnt sure how that worked

  5. anonymous
    • 5 years ago
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    Now, how do you solve for x?

  6. anonymous
    • 5 years ago
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    12(-6)=-72

  7. anonymous
    • 5 years ago
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    x=-6

  8. anonymous
    • 5 years ago
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    but then how do i solve for y, the problem is asking for the solution

  9. anonymous
    • 5 years ago
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    good.. so now you have to put that back into one of the equations to find y I will use the first one.

  10. anonymous
    • 5 years ago
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    6x + 2y = -28 6(-6) + 2y = -28 -36 + 2y = -28 2y = 8 y = 4 Answer (-6,4)

  11. anonymous
    • 5 years ago
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    so do u add -36 or subtract it from both sides

  12. anonymous
    • 5 years ago
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    you add 36 because you are getting rid of -36

  13. anonymous
    • 5 years ago
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    the sign before a number ALWAYS goes with the number and you do the opposite.

  14. anonymous
    • 5 years ago
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    -28--36 =8 or -28+-36 makes -64

  15. anonymous
    • 5 years ago
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    -28 + 36 = 8 (-- is +)

  16. anonymous
    • 5 years ago
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    ok thats what i thought so then 2y=8 2(4)=8 y=4

  17. anonymous
    • 5 years ago
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    quick lesson x + 5 = 10 you - 5 because it says + 5 x - 4 = 10 you + 4 because it says - 4 7 + x = 10 you - 7 because you have + 7 -6 + x = 10 you + 6 because you have -6

  18. anonymous
    • 5 years ago
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    2y = 8 because it says 2 times y you divide by 2 2y 8 -- = -- 2 2 the 2's cancel to leave you with y = 4

  19. anonymous
    • 5 years ago
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    (-6,4) is the solution

  20. anonymous
    • 5 years ago
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    right

  21. anonymous
    • 5 years ago
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    Yes

  22. anonymous
    • 5 years ago
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    ok thank you so much

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spraguer (Moderator)
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