Calculus/Graphing linear functions  From Wikibooks, open books
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Functions Calculus Precalculus/Exercises → Graphing linear
functions Graph of y=2x  It is sometimes difficult to understand
the behavior of a function given only its definition; a visual
representation or graph can be very helpful. A graph is a set of
points in the Cartesian plane, where each point (x,y) indicates
that f(x)=y. In other words, a graph uses the position of a
point in one direction (the vertical-axis or y-axis) to indicate
the value of f for a position of the point in the other
direction (the horizontal-axis or x-axis).  Functions may be
graphed by finding the value of f for various x and plotting the
points (x, f(x)) in a Cartesian plane. For the functions that
you will deal with, the parts of the function between the points
can generally be approximated by drawing a line or curve between
the points. Extending the function beyond the set of points is
also possible, but becom