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anonymous
 4 years ago
Find all solutions of the following linear congruence.
\(3x\equiv2\mod7\)
First of all, we notice that \((3,7)=1\). Therefore, we will only have \(1\) solution.
We now need to obtain a solution of the linear, diophantine equation \(3x7y=2\). The Euclidean algorithm gives:
\(7=3\cdot2+1\),
\(3=1\cdot3+0\).
Hence, \(7\cdot13\cdot2=1\) and \(7\cdot23\cdot4=2\). Therefore, a particular solution to the diophantine equation is \(x_0=4\), \(y_0=2\) and all solutions of the linear congruences are given by \(x\equiv4\equiv3\mod7\).
Am I right?
anonymous
 4 years ago
Find all solutions of the following linear congruence. \(3x\equiv2\mod7\) First of all, we notice that \((3,7)=1\). Therefore, we will only have \(1\) solution. We now need to obtain a solution of the linear, diophantine equation \(3x7y=2\). The Euclidean algorithm gives: \(7=3\cdot2+1\), \(3=1\cdot3+0\). Hence, \(7\cdot13\cdot2=1\) and \(7\cdot23\cdot4=2\). Therefore, a particular solution to the diophantine equation is \(x_0=4\), \(y_0=2\) and all solutions of the linear congruences are given by \(x\equiv4\equiv3\mod7\). Am I right?

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myininaya
 4 years ago
Best ResponseYou've already chosen the best response.1I have a way but you might now like it

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i am sure this is right, but i would write the following \[3x\equiv2\mod7\] \[3x\equiv9\mod7\] \[x\equiv3\mod7\]

myininaya
 4 years ago
Best ResponseYou've already chosen the best response.1\[3x \equiv 2 \mod 7 =>3x=2+7k\] k=0, there is no integer x k=1, x=3 k=2, there is no integer x k=3, there is no integer x k=4, x=10 k=5, there is no integer x k=6, there is no integer x k=7, x=17 so on... so we have x=...,3,10,17,17+7,(17+7)+7, and so on...

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0that is the usual gimmick. keep adding until you can divide to solve the congruence

myininaya
 4 years ago
Best ResponseYou've already chosen the best response.1x=3+7i where i is an integer

myininaya
 4 years ago
Best ResponseYou've already chosen the best response.1which is what satellite said

myininaya
 4 years ago
Best ResponseYou've already chosen the best response.1shhh... don't make fun of my inefficient way ;)
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