Take the derivative of the function.
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You find the slope of the tangent to the curve at the point of interest.
Use the four-step process to find the slope of the tangent line to the graph of the given function at any point.
Yes, the derivative of an equation is the slope of a line tangent to the graph.
find the derivative to get the slope, then using the graph of the other line given to you, find a point on the graph that they share and plug it in to find the y-value. then use the point slope formulahttp://docs.google.com/gview?a=v&q=cache:P72siWJTFjwJ:gato-docs.its.txstate.edu/slac/Subject/Math/Calculus/Findting-the-Equation-of-a-Tangent-Line/Finding%2520the%2520Equation%2520of%2520a%2520Tangent%2520Line.pdf+how+to+find+the+equation+of+a+tangent+line&hl=en&gl=us&sig=AFQjCNFcYzt1d-PU9hE2gbQKngp4FeRw3Q
Depends. Slope of tangent = instantaneous rate of change. Slope of secant = average rate of change.