Question 445286
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi, Note: 
Standard Form of an Equation of an Hyperbola opening "right and left" is  
            {{{(x-h)^2/a^2 - (y-k)^2/b^2 = 1}}} 
where Pt(h,k) is a center  with vertices 'a' units right and left of center.
 9x^2 - y^2 = 9
{{{x^2/1 - y^2/9 = 1}}} 
{{{drawing(300,300, -6, 6, -6, 6,   grid(1),
circle(0, 0,0.2),
circle(-1, 0,0.2),
circle(1,0,0.2),
graph(300,300, -6, 6, -6, 6, 0,3sqrt(((x)^2) -1),-3sqrt(((x)^2) -1)))}}}