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-2x=-4/:(-2)
x=2
-2-y=-6
-y=-6+2
-y=-4/:(-1)
y=4
b)
4x-5y=-4
-4x+6y=2,2
----------------
y=-1,8
-2x+3×(-1,8)=1,1
-2x+5,4=1,1
-2x=1,1-5,4
-2x=-4,3/:(-2)
x=2,15
+ {-x+y= 2
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-2x+0= -4
x= 2
-2+y=2
y= 4
b) {4x-5y= -4 /:2
{-2x+3y= 1,1
{2x-5:2y= -2
+ {-2x+3y= 1,1
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0,5y= -0.9
y= -1,8
-2x+3*(-1.8)= 1,1
-2x= 6,5
x= -3.25
odpowiedź Kini ma błędy w znakach -