Question 919631
Think of this arranged as x as a function of y.
{{{x=y^2-1}}}
{{{x=(y-1)(y+1)}}}


The graph of x is a parabola opening to the right, and has two y-intercepts readable directly from the factored equation.  The obvious y-intercepts are (0,-1) and (0,1).


Symmetry axis is the x-axis or {{{y=0}}}.