What are the variables (the items measured on the axes) in a graph of the (a)…

What are the variables (the items measured on the axes) in a graph
of the (a) consumption schedule and (b) saving schedule? Are the
variables inversely (negatively) related or are they directly
(positively) related? What is the fundamental reason that the
levels of consumption and saving in the United States are each
higher today than they were a decade ago?