SOLUTION: Function or Not a Function x+y=9 and x^2+y^2=1 and x=y^2

Question 699368: Function or Not a Function

x+y=9
and
x^2+y^2=1
and
x=y^2
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!

Function or Not a Function
To be a function, for each x you must have only one y value
..
x+y=9
This is a straight line so it is a function
and
x^2+y^2=1
This is an equation of a circle where an x can have two different y-values, therefore not a function
and
x=y^2
This is a parabola that opens right, so like the circle an x can have two different y-values, therefore not a function
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