Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
Vérifie la cohérence : \begincases x + y = 3 }, {2x + 2y = 7 \endcases
Vérifie la cohérence : \begincases x + y = 3 }, {2x + 2y = 7 \endcases
Natural Language
Math Input
Extended Keyboard
