Question 478559
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
The y-axis is the line of symmetry for these graphs
{{{drawing(300,300,   -6, 6, -6, 6, grid(1),
graph( 300, 300, -6, 6, -6, 6,0,2^x,2^(-x)))}}}