Question 1164265: which set of ordered pairs dose not represent a function?
{(-6,-9),(-2,-3),(-9,2),(2,-3)}
{(-2,0),(-5,8),(7,9),(6,8)}
{(6,9),(-7,8),(1,-4),(8,8)}
{(-2,-6),(-1,2),(-2,-7),(6,6)}
Answer by ikleyn(52799)   (Show Source):
You can put this solution on YOUR website! .
The basic prescription is THIS:
+-------------------------------------------------------------------------+
| If in the row of pairs, you see two pairs with equal first arguments, |
| but with different second arguments, |
| |
| then this row IS NOT a function. |
+-------------------------------------------------------------------------+
|
In more compact form, a function with equal inputs (first arguments) must produce equal outputs (second arguments).
So you can easily answer this question ON YOUR OWN, based on this rule.
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