December 2018 1 21 Report
Rozwiąż układ równań metodą podstawiania.

a)  \left \{ {{x-3y=1} \atop {2x-5y=7}} \right.

b)  \left \{ {{4x-3y=2} \atop {-2x+y=4}} \right.

c)  \left \{ {{2x+y=3} \atop {x-2y=4}} \right.
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