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-x-y=-6
-x+y=2
------------------
-2x=-4 /:(-2)
x=2
-2-y=-6
-y=-4 /:(-1)
y=4
b)
4x-5y=-4
-2x+3y=1,1 /*2
4x-5y=-4
-4x+6y=2,2
-----------------------
y=-1,8
4x-5*(-1,8)=-4
4x+9=-4
4x=-15/ :4
x=3,75
x=-3,75
y=-1,8
-x +y = 2
-2x = -4 /: (-2)
x = 2
-2 + y = 2
y = 4
b) 4x - 5y = -4
-2x + 3y = 1,1 /(*2)
4x - 5y = -4
-4x + 6y = 2,2
y = 6,2
4x - 5*6,2 = -4
4x - 31 = -4
4x = 27 /: 4
x = 6,75