Question

which statement shows a function?

Answer 1

\[a)x^2+y^2-2x-4y=-5\]\[b)x^2+y^2-2x-4y=-4\]\[c)x^2+y^2-2x-4y=-y\]\[d)x^2+y^2-2x-4y=-3\]
I think that (a) is a function because
\[x^2+y^2-2x-4y+5=0\]\[x^2+y^2-2x-4y+1+4=0\]\[(x-1)^2+(y-2)^2=0\]
so only answer for this statement is (1,2)

Answer 2

@k142.

Answer 3

@ganeshie8 . I need another help.