Is a positive graph a function?

A positive graph refers to a graph where all the values of the dependent variable (typically y) are greater than zero. Whether a positive graph represents a function depends on whether each input (x-value) corresponds to exactly one output (y-value). If it meets this criterion, regardless of being above the x-axis, it is indeed a function. Conversely, if any x-value maps to multiple y-values, it is not a function, even if the outputs are positive.