Răspuns:
x=3 , y=4
2x+y=10=>2·3+4=10 (A)
x-2y=-5=>3-2·4=3-8=-5 (A)
____________
x+y=7=>3+4=7 (A)
x+2y=10=>3+2·4=11 (F)
__________
-x+2y=-5=>-3+2·4=-3+8=5 (F)
3x+y=13=>3·3+4=9+4=13 (A)
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-2x+3y=6=>-2·3+3·4=-6+12=6 (A)
x-y=-1=>3-4=-1 (A)
doar pentru primul sistem solutiile date sunt reale
