A modulo system equation

73 Views Asked by At

Solve this equation system:

$$ \left\{ \begin{array}{c} x^2+2y+xy\equiv 3\pmod 7\\ x+2y^2+x^2y\equiv 4\pmod 7 \\ \end{array} \right. $$

I tried to turn them to linear equation to use the Chinese reminder theorem but I can't.

1

There are 1 best solutions below

2
On BEST ANSWER

Hint : Note that when you add the equations together, you get \begin{eqnarray*} (1+y)(2y+x+x^2)\equiv 0\pmod 7.\\ \end{eqnarray*} Should be a doddle from here ?