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A tangent line is drawn to the curve at . Trace the graph on your paper and add tangents at and .

Downward curve passing through the highlighted points (1 comma 1), (2, comma 2.5), (3, comma 3), which is the turning point, (4, comma 2.5), & (5, comma 1), & line passing through the point (2, comma 2.5) with slope of 1.

Use the eTool below to view the tangent lines.
Click on the link to the right to view the full version of the eTool: Slope at a Point eTool