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There are two cases to consider. The first is one in which you have a table which is generated using a linear equation and you merely want to reproduce the linear equation.Select any two distinct points, each of which will be represented by an ordered pair.

Suppose the pairs are (p, q) and (r, s).

Then the gradient of the line is (q - s)/(p - r).

Then using the point-and-gradient form of the equation:

y - s = [(q - s)/(p - r)]*(x - r)

Then simplify and rearrange to the required form.


The second case is where the table is based on observations for two variables which are linearly related. However, due to random variations or measurement errors (or rounding), the scatter plot for the data is nearly - but not quite a straight line. You will then need to use statistical techniques to obtain the equation. The best known is the method of least squares. However, this site does not support the mathematical symbols to illustrate the procedure.

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Q: How do you create a Linear Equation using data?
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