For your equation to work, A2:A6 must contain the y-values and B2:B6 the
x-values.
The text at the top of your numbers must NOT be included
I bet you have them the other way - since the other way is what we want for
charts
So use =SLOPE(B...., A.....)
But this does not explain the error you report - did you tell us everything?
If that does not work (and homework is not due tomorrow) send me the file --
to my private email
best wishes

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Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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>I am taking a science course and have to create a chart showing the slope
>and
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>
> Would appreciate some hep with this.