Straight Line

A straight set of points that continue on to infinity in both directions. A straight line on the xy plane is defined by the equation:

where
m = gradient
c = intercept on y-axis

When fitting a straight line to a set of experimental data the following may be applied to calculate the gradient (m) and y-axis intercept (c).



For two straight lines defined as:
and
If m1=m2 the lines are parallel.
If m1*m2=-1 the two lines are perpendicular.

See also: Intercept, Line, Line of Best Fit, Linear, Linear Regression, Pearson Product Moment Correlation Coefficient, Slope, Slope of a Linear Function.

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Subjects: Mathematics