Question 1058762
This is not a function because any value
I choose for {{{ x }}}, here are 2 values 
possible for {{{ y }}}, positive and negative.
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In order to be a function {{{ y = f(x) }}} , there must
be a unique {{{ y }}} for each {{{ x }}}
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For instance:
{{{ x = 1 }}}
{{{ y = 1 }}} and {{{ y = -1 }}}