Saturday, 5 March 2016

Using CRT ( or not ) solve the modular system.



Using CRT or not solve the following:

$$\begin{cases} x \equiv 19 \mod 49 \\ x \equiv 10 \mod 14 \end{cases} $$
And now, I don't know how to deal with it.
Please help me.


Answer



The first equation implies $x \equiv 5 \pmod 7$, while the second one implies $x \equiv 3 \pmod 7$. Therefore there is no solution to this set of congruences.


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