Question 787138
<pre>
A function cannot contain two ordered pairs with the same first coordinate.</pre>
A.	 {(-4, 3), (-4, 2), (1, 9), (6, 7)}<pre>
This is not a function because (-4,3) and (-4,2) are 
two ordered pairs with the same first coordinate -4.</pre>
B.	 {(-4, 3), (-2, 0), (2, 7), (3, 9)}<pre>
This is a function because all the ordered pairs 
have different first coordinates.</pre>
C.	 {(2, 1), (4, 2), (2, 3), (8, 4)}<pre>
This is not a function because (2,1) and (2,3) are 
two ordered pairs with the same fi1st coordinate 2.</pre>
D.	 {(0, 0), (0, 1), (2, 3), (4, 5)}<pre>
This is not a function because (0,0) and (0,1) are 
two ordered pairs with the same first coordinate 0.</pre>

Edwin</pre>