{(5, 2), (3, 4), (1, 2), (−1, 4)}
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The range of the function.
Interpolation in general is a way to determine intermediate values from a set of coordinates. Linear interpolation would be to fit a single linear function to the entire set of coordinates. Piecewise linear interpolation would then be to determine intermediate values from the set of coordinates by fitting linear functions between each set of coordinates. Connect-the-dots so to speak.
The codomain or range.
Domain describes all possible input values.
It is called the range of the function.