# Math Help - modulo help

1. ## Re: modulo help

Originally Posted by Tweety
1 = 9*27 -11*22,

but I do not understand how you know that x = - 11? Can you please explain?
This is because $9\cdot27\equiv0\pmod{27}$.

2. ## Re: modulo help

Reply to last tweety post:

22x=1(mod27) if 27 divides 1-22x which it does if x=-11: 1-(-11)22=9*27.

Also if x1 and x2 are sols of ax=b(modm), then ax1=ax2(modm) and if (a,m) =1, then you can cancel a to get all sols are “=” modm. So that x=…-38,-11,16,43,….

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