A straight stairlift functions a lot like an escalator. Straight stairlifts use an electric powered belt to propel the chair upward and to slowly release the chair downward.
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A linear function.
A function is an equation that is a straight line when plotted on a graph.
It is a continuous function. If the line is a straight line, it is a linear function.
A linear function is called "linear" because it represents a straight line. To graph a linear function, find two points that satisify that function, plot them, and then draw a straight line between them.
Linear function