Instance Variables Inheritance

Question

Can someone explain how a class can access the instance variables of its superclass and how that is not inheritance? I\'m talking about \'The Ruby Programming Language\' and the

Answer 1

It's confusingly worded. @x, @y, and @z are all instance variables on that Point3D instance. If that super(x,y) wasn't there, the Point3D instance would not have a @x or @y.