Math Learning Center
Boise State
©2010
Linear Graphing
Business
Graphing is an important skill in mathematics.
It gives us the ability to visualize the numerical concepts
we are discussing and to develop pictures which makes the concepts easier to comprehend.
The
primary format of graphing used in algebra is called the Cartesian graphing system.
It consists of two
axes, which divides the graph into four regions called quadrants:
Often we will need to graph objects which only have values that are positive or zero.
In this case we
only need to graph the first quadrant.
The purpose for pointing this out is to build the understanding that whether we use all four quadrants or
just one (or maybe two) quadrant(s), all of the techniques are the same.
When graphing, one valuable tool is the
t
chart.
The
t
chart is a simple method to list points directly
below the variable in a
t
format.
For example, if you are going to use straight line depreciation (linear
depreciation) for a new wheat combine just purchased for a farm, you would have a point with time = 0
Vertical axis
(yaxis)
Horizontal axis
(xaxis)
II
I
III
IV
I
Vertical axis
(yaxis)
Horizontal axis
(xaxis)
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Boise State
©2010
and value = $350,000.
Given a life span of about 8 years and an estimated salvage value of $30,000,
your second point would be time = 8 and value = $30,000.
Thus a
t
chart would look like
With the
t
chart, we can graph the two points and connect them with a line since we are using straight
line depreciation giving the following graph:
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 Fall '09
 ALINASCHIMPF
 Math, Algebra, René Descartes, Euclidean geometry, Math Learning Center

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