SOLUTION: WHICH RELATION IS NOT A FUNCTION Y=X+2 Y=X^2-4 X=Y^2-4Y X=3Y+4

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Question 64735: WHICH RELATION IS NOT A FUNCTION
Y=X+2
Y=X^2-4
X=Y^2-4Y
X=3Y+4
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
WHICH RELATION IS NOT A FUNCTION
Y=X+2
Y=X^2-4
X=Y^2-4Y
X=3Y+4
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x=y^2-4y is not a function
Why?
Let x=0
Then y^2-4y=0
y(y-4)=0
y=0 or y=4
With a single value of x there are two values of y.
Therefore the rule is not a function.
Cheers,
Stan H.