Finding the tangent line to the graph of a function at a single point can be extremely useful when interpreting the information that the function represents. So first to describe what a tangent line is: A tangent line of a function at one point shows the direction that the function is going at that point (Fig.1). Theoretically the tangent line is only touching the curve of the function at one single point, or the point of tangency. To find the equation of the tangent line, certain bits of information are required. One of these bits of information required is the slope of the tangent line. To find the slope of the tangent line of a function at a single point, the equation is used, assuming that “a” is the single point on the equation. The rest of this paper will be used to describe, through graphical methods, why this equation finds the slope of the tangent line.

The slope of any linear equation can be described as rise over run, y over x, the output of a function over the input of a function, or the dependent variable over the independent variable. All of these terms mean the same thing: the Y value on a graph over the X value on the graph. If the equation is examined closely, then it is clear that it represents a slope. The equation has the change of two output values, g(x) – g(a), over the change of two input values, x – a. The equation uses the change of an output, and the change of an input because two points on the graph is the minimum amount of information required to create a line.

Fig.2 and Fig.3 show how the two points on a graph can create an accurate tangent line. Fig.2 shows that two points on the function can create a secant line with a slope that is approximately close to the slope of the tangent line, but it is not accurate enough. Fig.3 shows that as the second point, D, on the function moves closer to the original point, C, the slope of the secant line approaches the slope of the tangent line. This movement shows how the...

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3.1 The Production Function
Production function is a tool of analysis used in explaining the input-output relationship.
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general form, it holds that production of a given commodity depends on certain specific
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outputs. A production function may take the form...

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...several possible drivers of salary costs for use in estimating a salary cost function. Using one of these cost drivers, apply the high-low technique to estimate the salary cost function for Delta Airlines. What driver did you select and why? How would Delta use this function to forecast costs? What are the advantages of this technique? The disadvantages?
2. Use simple regression to estimate the salary cost function for Delta...

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...Poverty Line is an economic benchmark and poverty threshold used by the government of India to indicate economic disadvantage and to identify individuals and households in need of government assistance and aid. It is determined using various parameters which vary from state to state and within states. The present criteria are based on a survey conducted in 2002. Going into a survey due for a decade, India's central government is undecided on criteria to identify families below...

...In mathematics, the exponential function is the function ex, where e is the number (approximately 2.718281828) such that the function ex is its own derivative.[1][2] The exponential function is used to model a relationship in which a constant change in the independent variable gives the same proportional change (i.e. percentage increase or decrease) in the dependent variable. The function is often written as exp(x),...

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