# Writing absolute value equations from a graph

Write a function that models this situation. That costs more than a human haircut at least my haircuts! This is the solution for equation 2. Plug these values into both equations.

And, even better, a site that covers math topics from before kindergarten through high school. This means we can write this absolute value function as a piecewise function. If you already know the solution, you can tell immediately whether the number inside the absolute value brackets is positive or negative, and you can drop the absolute value brackets.

To solve this, you have to set up two equalities and solve each separately. This is solution for equation 1. You may also be asked to take an absolute value graph and write it as a piecewise function: We learned how about Parent Functions and their Transformations here in the Parent Graphs and Transformations section.

Here are the graphs, with explanations on how to derive their piecewise equations: Writing an Equation with a Known Solution If you have values for x and y for the above example, you can determine which of the two possible relationships between x and y is true, and this tells you whether the expression in the absolute value brackets is positive or negative.

Sciencing Video Vault 1. You plan to sell She Love Math t-shirts as a fundraiser. You might want to review Solving Absolute Value Equations and Inequalities before continuing on to this topic. If you plot the above two equations on a graph, they will both be straight lines that intersect the origin.

Equation 2 is the correct one.

Learn these rules, and practice, practice, practice! Therefore, the piecewise function is: We have to start at 0, since dogs have to weigh over 0 pounds: 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.

Set Up Two Equations Set up two separate and unrelated equations for x in terms of y, being careful not to treat them as two equations in two variables: Put in numbers and try it!

Plug in known values to determine which solution is correct, then rewrite the equation without absolute value brackets. Piecewise Function Word Problems Problem: So, the piecewise function is: Obtaining Equations from Piecewise Function Graphs You may be asked to write a piecewise function, given a graph.

You can now drop the absolute value brackets from the original equation and write instead: When you take the absolute value of a number, the result is always positive, even if the number itself is negative. Note that this piecewise equation is non-continuous.

For a random number x, both the following equations are true: This means that any equation that has an absolute value in it has two possible solutions. The piecewise function is: Here are more examples, with explanations. You might want to review Quadratic Inequalities for the second example below: Welcome to She Loves Math!

So the whole piecewise function is:The lesson Solving and Graphing Absolute Value Inequalities: Practice Problems covers the following objectives: Understanding the difference between absolute value equations and inequalities.

Video: Graphing Absolute Value Equations: Dilations & Reflections Although a basic absolute value graph isn't complicated, transformations. How To: Solve an absolute value equation and graph the answer on a number line By getexcellent; 8/11/10 AM How To: Solve linear absolute value equations & inequalities How To: Write and graph an equation in slope intercept form.

Here are the graphs, with explanations on how to derive their piecewise equations: Absolute Value as a Piecewise Function. We can write absolute value functions as piecewise functions You may also be asked to take an absolute value graph and write it as a piecewise function. Chapter 2 Linear Equations and Functions Absolute Value Functions REPRESENTING ABSOLUTE VALUE FUNCTIONS In Lesson you learned that the absolute value of x is defined by: |x| = The graph of this piecewisefunction consists of two rays, is V-shaped, and opens up.

The corner point of the graph, called the occurs at the origin. Transcript of Graphing Absolute Value Equations. What is Absolute Value? Absolute value is how far a number is from zero A V-Shape graph that points upward or downward is the graph of an absolute value equation.

In this lesson you will graph by translating the graph of y = | x | For writing absolute value equations, you write an.

Writing absolute value equations from a graph
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