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mwgc

  • 3 years ago

linear congruence: complete soln: 4x(is equivalent to) 5(mod 21) @Mathematics

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  1. bluebrandon
    • 3 years ago
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    when I did the EEA I got 4(-5) + 21(1) = 1

  2. mwgc
    • 3 years ago
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    but then you have to mult by 5

  3. mwgc
    • 3 years ago
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    then x=xnot+bn/d

  4. bluebrandon
    • 3 years ago
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    when I multiplied by 5 I got 4(-25) + 21(5) = 5

  5. mwgc
    • 3 years ago
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    o ya then xnot is -25

  6. mwgc
    • 3 years ago
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    x=-25+21n

  7. bluebrandon
    • 3 years ago
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    your way of writing things is different then how I did it

  8. mwgc
    • 3 years ago
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    you have to find all solutions

  9. bluebrandon
    • 3 years ago
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    yeah I got x is congruent to 17 (mod 21)

  10. mwgc
    • 3 years ago
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    k so where do i go from here

  11. bluebrandon
    • 3 years ago
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    from the EEA you just convert it back into congruent form I think

  12. mwgc
    • 3 years ago
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    so x is congruent to -25 is congruent to what

  13. bluebrandon
    • 3 years ago
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    so 4(-25) congruent to 5 (mod 21) so x congruent to -25 (mod 21/1) is the complete solution and that is equivalent to x congruent to 17 (mod21/1

  14. bluebrandon
    • 3 years ago
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    since (-25) is some solution for x

  15. bluebrandon
    • 3 years ago
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    then you just put it into the Linear Congruence Theorem, V1

  16. bluebrandon
    • 3 years ago
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    to get the complete solution

  17. mwgc
    • 3 years ago
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    o crap ok now i see it

  18. bluebrandon
    • 3 years ago
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    I don't know this stuff super well either lol

  19. mwgc
    • 3 years ago
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    did you show eea?

  20. bluebrandon
    • 3 years ago
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    yeah I put it in there

  21. mwgc
    • 3 years ago
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    but theres no room

  22. bluebrandon
    • 3 years ago
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    the EEA for those were really short so I just wrote it in there tiny

  23. bluebrandon
    • 3 years ago
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    have you done any other problems on the assignment? I'm stuck on 5c lol

  24. mwgc
    • 3 years ago
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    only up to 3

  25. bluebrandon
    • 3 years ago
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    ok well I guess I might try asking on here again then

  26. mwgc
    • 3 years ago
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    metoo

  27. mathTalk
    • 3 years ago
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    4x(is equivalent to) 5(mod 21) 21 | 4x-5 21|4*(-4)-5 Hence -4 is a solution. ??? I am not sure.

  28. mwgc
    • 3 years ago
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    i dunno

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