# Write an absolute value equation representing a function

This is the solution for equation 2. If you plot the above two equations on a graph, they will both be straight lines that intersect the origin. Sciencing Video Vault 1. What are the solutions of the first equation? What are these two values? Provide additional opportunities for the student to write and solve absolute value equations.

To solve this, you have to set up two equalities and solve each separately. Then explain why the equation the student originally wrote does not model the relationship described in the problem. Evaluate the expression x — 12 for a sample of values some of which are less than 12 and some of which are greater than 12 to demonstrate how the expression represents the difference between a particular value and A difference is described between two values.

Plug in known values to determine which solution is correct, then rewrite the equation without absolute value brackets. Questions Eliciting Thinking How many solutions can an absolute value equation have? If needed, clarify the difference between an absolute value equation and the statement of its solutions.

Ask the student to solve the equation and provide feedback. This means that any equation that has an absolute value in it has two possible solutions.

When you take the absolute value of a number, the result is always positive, even if the number itself is negative.

This is solution for equation 1. Questions Eliciting Thinking Can you reread the first sentence of the second problem? Writes the solutions of the first equation using absolute value symbols. What is the difference? For a random number x, both the following equations are true: Examples of Student Work at this Level The student correctly writes and solves the first equation: Examples of Student Work at this Level The student: 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: 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.

For example, represent the difference between x and 12 as x — 12 or 12 — x. Instructional Implications Provide feedback to the student concerning any errors made.

Equation 2 is the correct one. Do you think you found all of the solutions of the first equation?

Do you know whether or not the temperature on the first day of the month is greater or less than 74 degrees? Why is it necessary to use absolute value symbols to represent the difference that is described in the second problem?

Ask the student to consider these two solutions in the context of the problem to see if each fits the condition given in the problem i.

Instructional Implications Model using absolute value to represent differences between two numbers. Got It The student provides complete and correct responses to all components of the task.

Plug these values into both equations. Emphasize that each expression simply means the difference between x and Guide the student to write an equation to represent the relationship described in the second problem.

Should you use absolute value symbols to show the solutions?

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. Finds only one of the solutions of the first equation. You can now drop the absolute value brackets from the original equation and write instead:Questions Eliciting Thinking.

Why was it necessary to use absolute value to write this equation? How many solutions do you think this equation has? Graph absolute value functions like f(x)=|x+3|+2. Scaling & reflecting absolute value functions: equation. Scaling & reflecting absolute value functions: graph. Practice: Scale & reflect absolute value graphs.

Graphing absolute value functions. Practice: Graph absolute value functions. How to find an equation given the absolute value graph? Ask Question. up vote 3 down vote favorite.

1. my question is how can i get a equation out of this i have gathered the following Writing an equation for a log function given the graph. 5. How to graph this sin equation?

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The absolute value function of a real number returns its value irrespective of its sign, whereas the sign (or signum) function returns a number's sign irrespective of its value.

The following equations show the relationship between these two functions. How to Write an Absolute-Value Equation That Has Given Solutions By Chris Deziel; Updated April 25, You can denote absolute value by a pair of vertical lines bracketing the number in question.

Here is a list of all of the skills that cover functions and equations! These skills are organized by grade, and you can move your mouse over any skill name to preview the skill. DD.2 Graph an absolute value function; DD.3 Domain and range of absolute value functions: D.8 Write the equation of a linear function; D.9 Linear functions.

Write an absolute value equation representing a function
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