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Mathematics, 30.10.2020 06:10 mem81

Which relation is not a function? 1) (x - 2)^2 + y^2= 4
2) x^2 + 4x + y = 4
3) x+y= 4
4) XY = 4

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Which relation is not a function? 1) (x - 2)^2 + y^2= 4
2) x^2 + 4x + y = 4
3) x+y= 4
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