multiple choice question

Question

which is a possible value for n, if y is a function of x.

x,y

3,-2

-2,7

0,-2

2,4

n,6

a.-9 b.-2. c.3. d.0

Answer 1

It is not possible for one value of x to correspond to more than one value of y. (If it could, we would not have a function.) That rules out choices (b), (c), and (d). Choice (a) is correct.