Question 165465
I'm assuming those are absolute value symbols?

{{{Y[1]= abs(X)}}}
{{{Y[2]=abs(-X)}}}
In that case, the graphs are identical.
Take x=1,
{{{Y[1]= abs(X)=abs(1)=1}}}
{{{Y[2]= abs(-X)=abs(-1)=1}}}
{{{ graph( 300, 300, -10, 10, -10, 10, abs(x), abs(-x)) }}}