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Unformatted text preview: line. So, we can use the slope to tell us something about just how steep a line is. © 2007 Paul Dawkins 162 http://tutorial.math.lamar.edu/terms.aspx College Algebra Next, we can see that if the slope is a positive number then the line will be increasing as we move
from left to right. Likewise, if the slope is a negative number then the line will decrease as we
move from left to right.
We can use the final two parts to see what the slopes of horizontal and vertical lines will be. A
horizontal line will always have a slope of zero and a vertical line will always have an undefined
slope.
We now need to take a look at some special forms of the equation of the line.
We will start off with horizontal and vertical lines. A horizontal line with a yintercept of b will
have the equation, y =b
Likewise, a vertical line with an xintercept of a will have the equation, x=a
So, if we go back and look that the last two parts of the previous example we can see that the
equation of the line for the horizontal line in the third part is y=2 while t...
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 Spring '12
 MrVinh

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