Statistics Dictionary

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Line

Lines in a Cartesian plane can be described algebraically by the following linear equation:

y = mx + b

where:
     m is the slope of the line.
     b is the y-intercept of the line.
     x is the independent variable.
     y is the dependent variable.

The scatterplot above shows how different equations result in different lines. Note that the green and blue lines have the same y intercept (b=1). so they cross the Y axis at the same point (0,1). The red and blue lines have the same slope (m=1), so they are parallel.