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

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Question 699378: Function or Not a Function
x+y=9
and
x^2+y^2=1

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
x%2By=9 this is linear equation, graph is a line, no x-values repeating; so, it IS a function
+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C-x%2B9%29+
and
x%5E2%2By%5E2=1...here you have a circle



In any Cartesian coordinate system,a circle does not correspond to a function.