Question

Which set of ordered pairs represents a function

Answer 1

{(3,-1), (7,1), (-6,-1), (9,1), (2,-1)}.

Explanation:

You need to know that to be a function each x value (first component) has to have one only y value (second component). In the option 1 the first component 1 has two different y values (5 and -3), in option 3 the x value -2 has two different y values (-5 and 9) and in option four the x value -3 has three different y values (1, 2 and -3). Then, the correct option y the second one.

Answer 2

For a relation to be a function, it can only have 1 of each number as an X value. If there are 2 or more identical X values it cannot be a function. The X value is the first value inside the parenthesis. (X,Y)

The only one that does not have two of the same X values is the 2nd answer.