A = {x | x > 0, X ∈ r}, B = {y | y ∈ r}, the corresponding relation F: X - &; Y & ᙧ 178; = 3x indicates whether y is a function of X?

A = {x | x > 0, X ∈ r}, B = {y | y ∈ r}, the corresponding relation F: X - &; Y & ᙧ 178; = 3x indicates whether y is a function of X?

It can not be said that y is a function of X, because y & # 178; = 3x, one X value corresponds to two Y values, which does not conform to the definition of function
It can be said that x is a function of Y, that is, x = 1 / 3Y & # 178;