September 2018 1 16 Report

a)  \left\{ {{x+y=5} \atop {x-2y=-1}} \right

b) \left \{ {{y-x=4} \atop {3(x+y)=24}} \right

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

d)  \left \{ {{2(x+y)-(x-1)=y+2} \atop {x+y=1}} \right

prosze o rozpisanie co z czego się wzięło


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