Non-linear equations

Lessons

1. Graph the following non-linear equations and determine if the relation is also a function.
   
   i) $y = x^2 +2$
   
   ii) $x = {1 \over 2} y^2$
   
   iii) $y = {2 \over x}$
   
   iv) $y = \sqrt {x - 2}$
   
   v) $y = x^3 - 2$
   
   vi) $x^2 - y^2 = 9$