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Unformatted text preview: and after the next chapter you will be able to quickly graph this without
much effort. However, we haven’t gotten that far yet and so we will need to choose some values
of x, plug them in and compute the y values.
As mentioned earlier, it helps to have an idea of what this graph is liable to look like when
picking values of x. So, don’t worry at this point why we chose the values that we did. After the
next chapter you would also be able to choose these values of x.
Here is a table of values for this equation.
-2 5 -1 0 0 -3 1 -4 2 -3 3 0 4 ( x, y )
( -2,5 )
( -1, 0 )
( 0, -3)
(1, -4 )
( 2, -3)
( 3, 0 )
( 4,5 ) y 5 Let’s verify the first one and we’ll leave the rest to you to verify. For the first one we simply plug
x = -2 into the equation and compute y. y = ( -2 - 1) - 4
2 = ( -3 ) - 4
Here is the graph of this equation. © 2007 Paul Dawkins 155 http://tutorial.math.lamar.edu/terms.aspx College Algebra Notice that when we set up the axis system in this example, we only set up as much as we needed.
For example, since we didn’t go past -2 with our computations we...
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- Spring '12