# How to write an absolute value equation from a graph

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

If you plot the above two equations on a graph, they will both be straight lines that intersect the origin. 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.

This is solution for equation 1. Questions Eliciting Thinking How many solutions can an absolute value equation have? Guide the student to write an equation to represent the relationship described in the second problem.

Why is it necessary to use absolute value symbols to represent the difference that is described in the second problem?

Should you use absolute value symbols to show the solutions? Do you know whether or not the temperature on the first day of the month is greater or less than 74 degrees?

Examples of Student Work at this Level The student: A difference is described between two values. Emphasize that each expression simply means the difference between x and To solve this, you have to set up two equalities and solve each separately.

Writes the solutions of the first equation using absolute value symbols. Sciencing Video Vault 1. 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: Finds only one of the solutions of the first equation.

What is the difference? Plug in known values to determine which solution is correct, then rewrite the equation without absolute value brackets.

Do you think you found all of the solutions of the first equation? Then explain why the equation the student originally wrote does not model the relationship described in the problem. When you take the absolute value of a number, the result is always positive, even if the number itself is negative.

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.You can denote absolute value by a pair of vertical lines bracketing the number in question.

When you take the absolute value of a number, the result is always positive, even if the number itself is negative. The general form of an absolute value function is f(x)=a|x-h|+k.

From this form, we can draw graphs. This article reviews how to draw the graphs of absolute value functions. Writing Absolute Value Functions — Writing Basic Absolute Value Equations Given the Graph. For absolute value equations multiplied by a constant (for example, y = a | x |),if 0 1, it is stretched.

Also, if a is negative, then the graph opens downward, instead of upwards as usual. Oct 26,  · How to write an absolute value inequality from a graph. How to write an absolute value inequality from a graph. Skip navigation Sign in.

Write an absolute value equation from a. Absolute Value Functions To graph an absolute value function you may find it helpful to plot the vertex and one other point. Use symmetry to plot a third point and then complete the graph.

Writing an Absolute Value Function Write an equation of the graph shown. SOLUTION The vertex of the graph is (0, º3), so the equation has the form.

How to write an absolute value equation from a graph
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