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# Tangents to a Curve

## Slope of a tangent equals a limit where difference in x values approaches zero.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Tangents to a Curve

Calculate the equation of a line tangent to a curve at a single point.
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## Slope of the Tangent and Secant Lines

Tangents to a Curve Interactive
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## Equation of a Tangent Line

Shows you how to find the equation of the line tangent to f(x)=xe^x when x=1.
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