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Rezolvati prin metoda reducerii urmatoarele sisteme:
10x-7y=-18
-4x+5y=16


Răspuns :

10x-7y=-18 |x5 -4x+5y=16 |x7 50x-35y=-90 -28x+35y=112 --------------(+) 22x=22. |:22 X=1 10x-7y=-18. |x4 -4x+5y=16. | X10 40x-28y=-72 -40x+50y=160 -------------(+) 32y=88. |:32 Y=88/32 |:8~simplifici Y=11/4 S={1;11/4}