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The use of a linear equation to predict values that are OUTSIDE the range of data.
The use of a linear equation to predict values that are INSIDE of the data range.
An equation to the form y-y = m (x - x₁), where M is the slope and (x₁,y₁) is a given point on a non vertical line.
The ratio of change in the y-intercept (rises) to the corresponding change in the x-intercept (run) as you move from one point to another along a line.
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