February 2019 0 19 Report
Pomocy !

Rozwiąż układ równań metodą podstawiania.

a)  \left \{ {{x+y=4} \atop {x-y=3}} \right.
b)  \left \{ {{x+4y=-11} \atop {3x-2y=9}} \right.
c)  \left \{ {{-2x+y=4} \atop {5x+4y=-23}} \right.
d)  \left \{ {{-2x=3y-2} \atop {y-6x=-6}} \right.
e)  \left \{ {{x-2y=1} \atop {3x+4y=13}} \right.
f)  \left \{ {{0=5x+4y+14} \atop {x=3y+20}} \right.
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