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x - y = 2
---------------------
2x = 10 | :2
X= 5
X - y = 3
5 - y = 2
-Y = -5 + 2
-y = -3 | (-1)
Y= 3
X =5, y =3
--------------------------------------------------------------
4x+ 11y = 1
2x + 3y= 3 | (-2)
4x +11y =1
-4x -6y = -6
---------------
5 y = - 5
Y= -1
2x +3y=3
2x + 3×(-1)=3
2x= 3+3
2x =6 | :2
X = 3
Y= -1, x=3