Homework Help: Pre-Algebra

Posted by Cheryl on Monday, May 2, 2011 at 10:04am.

Okay so I have no clue how to determine if a relation is a function.
Here is an example can you tell me how to determine this? D:

Example:
Determine whether the relation is a function. {(-5,5), (-2,5), (0,5), (2,5)}

Thanks in advance

Pre-Algebra - bobpursley, Monday, May 2, 2011 at 10:08am
a funcion has a one to one relationship.

here, for each x, it maps into a single distinct y. Each x here maps to a y.

Now, the reverse: is x a function of y? No, because for y=5, x can be -5, -2, 0, or 2. x is not a function of y.

What if you had added the point (-5,4)? Then y would not be a function of x, because if x=-5, it maps into both 4, and 5. Not a function then
Pre-Algebra - Cheryl, Monday, May 2, 2011 at 10:13am
Thanks

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