Suppose Roberto Barrera added this sentence to the end of the fourth section. Which would correctly identify the author's meaning for the word present? Consider the effect of the stressed or unstressed syllable in the word present.

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.