Odpowiedź:
[tex]\left \{ {{3x-2y}=7 \atop {y-x=-4}} \right. \\\left \{ {{3x-2y}=7 \atop {x=4+y}} \right.\\3(4+y)-2y=7\\y=-5\\x=4-5\\x=-1\\(x,y)=(-1,-5)\\\left \{ {{3*(-1)-2*(-5)=7} \atop {-5-(-1)=-4}} \right.\\\left \{ {{7=7} \atop {-4=-4}} \right. \\[/tex]
(x,y)=(-1,-5) Odp B
