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anonymous

  • one year ago

-6x-y=-25 -3x+4y=19 Solve Eacg System By Elimination Steps Only Please

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  1. LynFran
    • one year ago
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    mutiple the 2nd equation throughout by 2 to get .equation 3\[-6x+8y=38\]..then take away the 1st and 3rd equatio

  2. anonymous
    • one year ago
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    you could also multiply the first equation by 4 and then add the 2 equations

  3. anonymous
    • one year ago
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    Can Someone Show Me The Steps Because I Got The Answer Already

  4. LynFran
    • one year ago
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    \[-6x-y=-25\]\[-(-6x+8y=38)\]

  5. LynFran
    • one year ago
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    note that the x will cancel leaving \[-9y=-63\]then we can solve for y by dividing both side of the equation by -9

  6. LynFran
    • one year ago
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    so what will y=?

  7. anonymous
    • one year ago
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    -72

  8. LynFran
    • one year ago
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    \[y=\frac{ -63 }{ -9 }\]

  9. anonymous
    • one year ago
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    Oh So Dont Solve It ?

  10. LynFran
    • one year ago
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    |dw:1439776842102:dw|

  11. anonymous
    • one year ago
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    -63/-9=7

  12. LynFran
    • one year ago
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    correct now since we know that y=7 we can sub y=7 into equation 1 or 2

  13. LynFran
    • one year ago
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    to find what is x..

  14. anonymous
    • one year ago
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    Can You Show Me ?

  15. imqwerty
    • one year ago
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    -6x-y=-25 - 1equation -3x+4y=19 - 2nd equation Double the second nd subtract from first so as to eleminate x -6x-y - 2(-3x+4y)=-25-2(19) -6x-y+6x-8y=-25-38 -9y=-63 y=-63/-9 y=7 Put this valur of y in any of the two equation s nd get the value of x -6x-y=-25 -6x-7=-25 -6x=-25+7 -6x=-18 x=-18/-6 x=3

  16. LynFran
    • one year ago
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    using equation 1 |dw:1439777075716:dw|

  17. anonymous
    • one year ago
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    Thanks You Both :) You Helped !

  18. LynFran
    • one year ago
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    welcome

  19. imqwerty
    • one year ago
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    no prblem :) u r welcome

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