We have written an absolute value inequality that models this relationship. If w is less thanit's going to be a negative number. So let's solve each of these. Sciencing Video Vault Isolate the variable in both equations to find the two solutions of the absolute value equation.

So its absolute value is going to be greater than a.

These are the x's that satisfy this equation. So this, you could say, this could be all of the numbers where x is greater than negative In interval notation, it would be everything between negative 12 and positive 12, and not including those numbers.

Place a solid dot on the two points corresponding to the solutions of the equation found in Step 3 -- 3 and 7. This question concerns absolute value, so the number line must show that Or less than or equal to negative 3.

Split the equation into two separate equations: You shouldn't be memorizing any rules.

That's the solution set right there. Draw a number line with 0 and the two points clearly labeled. In the example, label points -1, 0 and 7 on the number line from left to right. If our absolute value is greater than or equal to 21, that means that what's inside the absolute value has to be either just straight up greater than the positive 21, or less than negative C A ray, beginning at the point 0.

So that means that f of x is either just straight up greater than positive a, or f of x is less than negative a. And then divide both sides by 2. Draw a number line with 0 and the two points clearly labeled make sure the points increase in value from left to right. Their absolute value is more than Absolute Value Inequality Isolate the absolute value term in the inequality by subtracting any constants and dividing any coefficients on the same side of the equation.

And I don't want you to just memorize it, but I'll give it to you just in case you want it. The width has to be less than or equal to You get, in this case, x is greater than-- you don't have to swap the inequality, because we're dividing by a positive number-- negative 58 over 2 is negative 29, or, here, if you divide both sides by 2, or, x is less than negative The dog can pull ahead up to the entire length of the leash, or lag behind until the leash tugs him along.

Now over here, subtract 3 from both sides. And that's the range. If we add to both sides of these equations, if you add and we can actually do both of them simultaneously-- let's add on this side, too, what do we get. Let's do a harder one. So we could write 7x needs to be one of these numbers.

Well, what are these numbers. He cannot be farther away from the person than two feet in either direction. So the width of our leg has to be greater than So the solution is, I can either be greater than 29, not greater than or equal to, so greater than 29, that is that right there, or I could be less than negative.

After we’ve mastered how to solve Absolute Value Inequalities, we are going to learn how to write an equation or inequality involving absolute value to describe a graph or statement. Now, when solving Absolute Value Inequalities, we must never lose sight of. Solve + Graph + Write Absolute Value Inequalities This lesson is all about putting two of our known ideas, Absolute Value and Inequalities, together in order to Solve Absolute Value Inequalities.

Whereas the inequality $$\left | x \right |>2$$ Represents the distance between x and 0 that is greater than 2. You can write an absolute value inequality as a compound inequality. $$\left | x \right |0$$ $$=-cc,\: where\: c>0$$ $$=ax+bc$$ You can replace >. First we graph our boundaries; we dash the line if the values on the line are not included in the boundary.

If the values are included we draw a solid line as before. Second we test a point in each region. How Do You Graph an Inequality or an Infinite Set on a Number Line? Number lines are really useful in visualizing an inequality or a set.

In this tutorial, you'll see how to graph both. Because of how absolute values behave, it is important to include negative inputs in your T-chart when graphing absolute-value functions. If you do not pick x -values that will put negatives inside the absolute value, you will usually mislead yourself as to what the graph looks like.

How do you write an absolute value inequality for a graph
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Absolute value inequalities word problem (video) | Khan Academy