I don't remember how to do this, but I'm suppose to determine if these relations are a function or not, then I'm suppose to figure out their domains and range.
1. {(1, 2), (1, 3), (-1, 4), (-1, 5)}

2. {(1, 1), (2, 2), (3, 3), (4, 4)}

Question

I don't remember how to do this, but I'm suppose to determine if these relations are a function or not, then I'm suppose to figure out their domains and range.
1. {(1, 2), (1, 3), (-1, 4), (-1, 5)}

2. {(1, 1), (2, 2), (3, 3), (4, 4)}

anonymous · Answer

I think the 1 isn't a function and 2 is. but I am not sure, then I forgot how to determine their domains and range

anonymous · Answer

you any good at these @terenzreignz

terenzreignz · Answer

Oh sure. Simple.
If you see two ordered pairs with THE SAME LEFT COORDINATE but DIFFERENT RIGHT COORDINATES, then it's not a function.

anonymous · Answer

so 1 isn't a function and 2 is, but how do I find the domains and ranges

anonymous · Answer

?

terenzreignz · Answer

domain is the set of all left-cordinates
range is set of all right-coordinates.
simple

anonymous · Answer

oh ya I remember this, so the domain for 1 is (1,-1)
and the range is (2,3,4,5)

anonymous · Answer

and for 2 it's 
domain: (1,2,3,4)
range:(1,2,3,4)

anonymous · Answer

right?@terenzreignz

terenzreignz · Answer

correct
But use {}
and not ()
when noting sets.

anonymous · Answer

got it thanks!!!!!!!!!!!!!!!!!!!