problems in fitting a line

C

Crimzon

I am using XLFIT4 (software that adds some functionality to MS EXCEL)
for plotting a graph with x, y and z values. XLFIT plots the curve in
3D space., but I want to find a straight line equation(approximation,
like the least square fit) like z = some function of x and y., from
the set of data points I have,
1) does anyone know a way in which I can find the equation of a
straight line in 3d space given a set of x, y and z values., I know MS
Excel does that for 2D.,I am lost for 3D..
help please :(
 

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