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pokemon23

  • 3 years ago

If 20 is added to a number the result is the same as 55 decreased by four times the number.Find the number. Help me If 20 is added to a number the result is the same as 55 decreased by four times the number.Find the number. Help me @Mathematics

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  1. pokemon23
    • 3 years ago
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    20+x=55-4x

  2. heisenberg
    • 3 years ago
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    setup an equation with simple algebra. The "unknown" = the "number."

  3. pokemon23
    • 3 years ago
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    is this correct?

  4. heisenberg
    • 3 years ago
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    Yep that's right.

  5. pokemon23
    • 3 years ago
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    thanks

  6. heisenberg
    • 3 years ago
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    can you solve those together? there are a few techniques for this.

  7. pokemon23
    • 3 years ago
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    let me see

  8. pokemon23
    • 3 years ago
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    20=55-3x

  9. pokemon23
    • 3 years ago
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    75=-3x

  10. heisenberg
    • 3 years ago
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    not quite. to get rid of the x on the left, subtract x to both sides. -4x - (1)x = -5x

  11. heisenberg
    • 3 years ago
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    same with the 55.

  12. pokemon23
    • 3 years ago
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    75=-5x

  13. heisenberg
    • 3 years ago
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    what about: 25 - 55 = ?

  14. pokemon23
    • 3 years ago
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    isn't 20

  15. pokemon23
    • 3 years ago
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    subtract 55

  16. heisenberg
    • 3 years ago
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    it's a negative number.

  17. pokemon23
    • 3 years ago
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    ?????????

  18. heisenberg
    • 3 years ago
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    20 - 55 = -35

  19. heisenberg
    • 3 years ago
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    you have to subtract 55 from both sides.

  20. pokemon23
    • 3 years ago
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    where did you get -35

  21. heisenberg
    • 3 years ago
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    20 - 55 = 20 + -55 = -55 + 20 = -35

  22. pokemon23
    • 3 years ago
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    -35=-5x

  23. heisenberg
    • 3 years ago
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    that's right.

  24. pokemon23
    • 3 years ago
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    x=7

  25. pokemon23
    • 3 years ago
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    ty sir?

  26. heisenberg
    • 3 years ago
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    booyah.

  27. pokemon23
    • 3 years ago
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    lol

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