Join IDNLearn.com and start exploring the answers to your most pressing questions. Ask any question and receive comprehensive, well-informed responses from our dedicated team of experts.
x2+y2=9 is not a function
In order for an equation to represent a function any single value of x must have at most one corresponding value of y which satisfies the equation.
For
x
2
+
y
2
=
9
XXXX
if (for example)
x=0XXXX there are two values for y (namely +3 and −3) which satisfy the equation