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What is 9x + 81 mod 19 congruent to?

 Oct 21, 2020
 #1
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What is 9x + 81 mod 19 congruent to?

 

81/19 = 4+5/19  so

 

\(9x + 81 \mod 19\; \equiv \;9x + 5 \mod 19\)

 Oct 21, 2020
 #2
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Sorry I meant 9x + 81y mod 19

Guest Oct 22, 2020
 #3
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9x+5y then

Melody  Oct 22, 2020

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