y=5-4x
x-2y=-1
x-2(5-4x)=-1
x-10-8x=-1
-7x = 9
x=-7/9
y=5-28/9
4x+y=5
x=-1+2y
4(-1+2y) +y =5
-4 + 8y +y=5
9y=9 /:9
y=1
x=-1+2*1=-1+2=1
odp:
x=1
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y=5-4x
x-2y=-1
y=5-4x
x-2(5-4x)=-1
y=5-4x
x-10-8x=-1
y=5-4x
-7x = 9
y=5-4x
x=-7/9
y=5-28/9
4x+y=5
x-2y=-1
4x+y=5
x=-1+2y
4(-1+2y) +y =5
-4 + 8y +y=5
9y=9 /:9
y=1
x=-1+2*1=-1+2=1
odp:
x=1
y=1