query

["gerald w. bracey" <gbracey@erols.com>]

This is not a set up for a gotcha.  I'd like people to tell me what level they think the following text is pitched at.  Any other commentary about it would be welcome as well.

"Each of the graphs in the preceding article shows a definite relation between two  quantities such that when one is known the other can be found either by experiment or by computation.  These quantities are usually represented by certain symbols such as p,v,x,y, etc, and are called variables.

DEFINITION:  a variable is a symbol which may represent an indefinite number of values throughout a particular discussion.

For example, in the equation A =pi X R squared, A and R are variables and represent the area and radius, respectively, of a circle.  When A is expressed in terms of R, R is called the independent variable and A the dependent variable or function of R.  In general, we may give the following definition:

If a variable y depends another variable x, so that whe a value of x is known, y is determined, then y is called a function of x.

That's it.

JB