To find: An expression for the function whose graph is the line segment.
The function of a line joining the two points is .
The graph is the line segment joining the points .
The slope (m) of a line segment joining the points is,
The equation of a line with slope (m) and a point is,
Use formula (1) and obtain the slope of a line segment joining the points .
Use formula (2) and obtain the equation of line with slope and the point (−5, 10).
Rearrange the terms and simplify.
Therefore the function is .
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