Obtaining Equations from Piecewise Function Graphs You may be asked to write a piecewise function, given a graph. To review how to obtain equations from linear graphs, see Obtaining the Equations of a Line, and from quadratics, see Finding a Quadratic Equation from Points or a Graph. Here are the graphs, with explanations on how to derive their piecewise equations: You might want to review Solving Absolute Value Equations and Inequalities before continuing on to this topic.

We know that when we plot this function in the Cartesian plane we get a straight line. This was explored in assignment one on graphs of linear functions.

The same is true with the quadratic functions, which we explored in assignment 2. Now that we are familiar with these functions and their graphs, we want to switch our attention to parametric equations. But what are parametric equations and what makes them different from the other equations.

Refer to figure 1. The only difference is that the first line is shorter while the second one seems to extend from negative infinity to positive infinity.

Remember we have put some restrictions on the value of t, t can only vary from -7 to If we were to change these values the length of the line would also change. But how are the two line related?

For the first line we have three unknown variables t, x and y. The two equations that we used to plot this line are called parametric equations. And t is the parameter.

Explore math with caninariojana.com, a free online graphing calculator. As a member, you'll also get unlimited access to over 75, lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed. The second step is writing formulas for each domain specified by the lines in the graph. The point-slope formula is used to identify the slope and y-intercept for the leftmost domain, which has a sloped line.

There are different types of parameters. A parameter could be an angle or a length. There are two basic conditions that a parameter must satisfy: Each point on the curve must be related to a unique value of the parameter. Let us just look at a simple example. We will now extend our discussion and look at the trigonometric functions.To write the equation of an ellipse, we must first identify the key information from the graph then substitute it into the pattern.

Remember the patterns for an ellipse: (h, k) is the center point, a is the distance from the center to the end of the major axis, and b is the distance from the center. This mathlet graphs a complex function in 3 space dimensions using color to represent the fourth dimension (see the help text for more details).

Conic Flyer: Manipulate different types of conic section equations on a coordinate plane using slider bars. Learn how each constant and coefficient affects the resulting graph.

Choose from vertical or horizontal parabola, circle, ellipse, and vertical or . Equation of Circle Interactive HTML5 Applet Explore and discover the standard form equation of a circle using the interactive circle below.

To move the circle just click and drag on either of the two points, and the circle's standard form equation will adjust accordingly. Standard form of the Equation of a Circle with center (h,k) and radius r. Standard form of the Equation of a Circle with center (h,k) and radius r Polar Equation Grapher: You can enter in your own theta min & theta max values, sketch traces & clear traces on command, etc.

Interactive Theorem Writing Prompt & Proof Prompt: If a point. PARAMETRIC CURVES.

A parametric curve in the plane is a pair of functions x = f (t) y = g (t) It is possible to derive the Cartesian equation from the parametric equations.

Let us look at the equation of this circle, Is there any connection between the equation of the circle and our parametric equations? and. Using the famous.

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Graphing Polar Equations