SOLUTION: Which if the following is a function? [(-4,1),(1,8),(-4,-2)] [(-4,1),(1,-8),(-2,-2)] [(-4,1),(1,-8),(1,-2)]

Question 148812This question is from textbook Glencoe Algebra 2
: Which if the following is a function?
[(-4,1),(1,8),(-4,-2)]
[(-4,1),(1,-8),(-2,-2)]
[(-4,1),(1,-8),(1,-2)] This question is from textbook Glencoe Algebra 2

Found 2 solutions by stanbon, nerdybill:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
[(-4,1),(1,-8),(-2,-2)]
is a function because each x-value has only one y-value.
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Cheers,
Stan H.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
For it to be a function, there must be a unique 'y' for every 'x'.
.
So, in the case of your problem:
[(-4,1),(1,8),(-4,-2)]
[(-4,1),(1,-8),(-2,-2)]
[(-4,1),(1,-8),(1,-2)]
.
Set 1: when x=-4 there are two possible y's
Set 3: when x=1 there are two possible y's
.
Therefore the only set that can be a function is Set 2.
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