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Unformatted text preview: problem; in fact, we can use these two points to
determine the missing slope of the line since we do know that we can always find that from any
two points on the line.
© 2007 Paul Dawkins 163 http://tutorial.math.lamar.edu/terms.aspx College Algebra So, let’s start off my finding the slope of the line. m= 5  4
9
=3  ( 2 )
5 Now, which point should we use to write down the equation of the line? We can actually use
either point. To show this we will use both.
First, we’ll use ( 2, 4 ) . Now that we’ve gotten the point all that we need to do is plug into the
formula. We will use the second form. y = 4 9
9
( x  ( 2 ) ) = 4  5 ( x + 2 )
5 Now, let’s use ( 3, 5 ) . y = 5  9
( x  3)
5 Okay, we claimed that it wouldn’t matter which point we used in the formula, but these sure look
like different equations. It turns out however, that these really are the same equation. To see this
all that we need to do is distribute the slope through the parenthesis and then simplify.
Here is the first eq...
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This note was uploaded on 06/06/2012 for the course ICT 4 taught by Professor Mrvinh during the Spring '12 term at Hanoi University of Technology.
 Spring '12
 MrVinh

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