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anonymous

  • one year ago

NEED HELP! Solve for n: 21k -3n + 9p > 3p + 12 A. n > 2p + 7k - 4 B. n < 2p + 7k - 4 C. n > -4p - 7k + 4 D. n < -4p - 7k + 4

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  1. dan815
    • one year ago
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    solve equations with inequality instead of equal sign is very similiar, only have to worry about sign changing operations

  2. anonymous
    • one year ago
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    i'm lost sorry

  3. dan815
    • one year ago
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    do you know how to solve this 21k -3n + 9p = 3p + 12

  4. dan815
    • one year ago
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    if there is an equal sign, how do you solve for n?

  5. anonymous
    • one year ago
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    first do i add something?

  6. dan815
    • one year ago
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    |dw:1434743334964:dw|

  7. dan815
    • one year ago
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    only difference is if u multiply both of them by -1 , then what was greater will be more negative

  8. dan815
    • one year ago
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    |dw:1434743494515:dw|

  9. dan815
    • one year ago
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    |dw:1434743610549:dw|

  10. dan815
    • one year ago
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    |dw:1434743716649:dw|

  11. dan815
    • one year ago
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    |dw:1434743745158:dw|

  12. dan815
    • one year ago
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    see how -1 works with the number line now?

  13. anonymous
    • one year ago
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    yes but now how do i start solving?

  14. dan815
    • one year ago
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    the same way you solve normal equations, only remember how multiplication by negative number changes it

  15. dan815
    • one year ago
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    21k -3n + 9p > 3p + 12 isolate for n

  16. dan815
    • one year ago
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    solve for n like you do a normal equation, keep track of the number of times you multiply by a negative number

  17. dan815
    • one year ago
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    if the number of times you multiply by a negative number is odd, then you flip sign else u keep the sign oriented same way

  18. anonymous
    • one year ago
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    can i put 3p and 12 together?

  19. dan815
    • one year ago
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    what do u mean?

  20. anonymous
    • one year ago
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    like terms

  21. dan815
    • one year ago
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    ya, u have to have n all by itself

  22. dan815
    • one year ago
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    21k -3n + 9p > 3p + 12 okay so we saw how adding and subtracting will keep the inequality, as everything just gets shifted left or right

  23. dan815
    • one year ago
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    |dw:1434744122685:dw|

  24. dan815
    • one year ago
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    |dw:1434744155894:dw|

  25. dan815
    • one year ago
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    21k -3n + 9p > 3p + 12 so subtract 21k from both side and 9p

  26. dan815
    • one year ago
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    21k -3n + 9p > 3p + 12 -3n > 3p+12 -21k -9p

  27. dan815
    • one year ago
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    what do you think we should to now?

  28. dan815
    • one year ago
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    u can go the other way too u can add 3n to both sides as well as subtract 3p and 12 from both sides 21k -3n + 9p > 3p + 12 21k + 9p -3p - 12 > 3n notice in this case it automatically takes care of the sign flip

  29. anonymous
    • one year ago
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    can you help me with another one? like walk through w me

  30. dan815
    • one year ago
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    yep, did u finish this one though, what did u get?

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