Which of the following sets of ordered pairs could represent a function? select all that apply. (3 points)

{(2,-,-,,3)}
{(-15)}
{(3,-,,,7)}
{(03)}
{(-10)}
{(-4,,-,-,1)}

A function should pass the vertical line test.

Graph each of the functions to determine whether it passes the vertical line test.
Set #1  is a function
Set #2 is a function
Set #3 is not a function
Set #4 is not a function
Set #5 is not a function
Set #6 is not a function 

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm