January 2019 0 15 Report
Rozwiąż układy równań: (Proszę! szybko!)
 \left \{ {{x+2y=5} \atop {y=-2x+1}} \right.

 \left \{ {{y=x-3} \atop {x+y=3} \right.

 \left \{ {{3x-2y=11} \atop {y=x-1}} \right.

 \left \{ {{x=5-y} \atop {{x+2y=15} \right.


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