To graph , we need to plot a series of points.
To get a series of points, we need to plug in various values of x to get corresponding values of y.
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Plug in to find y
When ,
So we have the point (-2, 16)
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Plug in to find y
When ,
So we have the point (-1, 8)
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Plug in to find y
When ,
So we have the point (0, 0)
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Plug in to find y
When ,
So we have the point (1, -8)
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Plug in to find y
When ,
So we have the point (2, -16)
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So we have this list of points
(-2, 16), (-1, 8), (0, 0), (1, -8), (2, -16)
Which gives us this table
x | y
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-2 | 16
-1 | 8
0 | 0
1 | -8
2 | -16
To graph the line, simply pick any two points and plot them. Then draw a straight line through those two points.