ACT Math : Algebra
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Example Question #431 : Algebra
What values of x make the following statement true?
|x – 3| < 9
x < 12
–6 < x < 12
6 < x < 12
–12 < x < 6
–3 < x < 9
–6 < x < 12
Solve the inequality by adding 3 to both sides to get x < 12. Since it is absolute value, x – 3 > –9 must also be solved by adding 3 to both sides so: x > –6 so combined.
Example Question #432 : Algebra
If –1 < w < 1, all of the following must also be greater than –1 and less than 1 EXCEPT for which choice?
w/2
|w|
3w/2
w2
|w|0.5
3w/2
3w/2 will become greater than 1 as soon as w is greater than two thirds. It will likewise become less than –1 as soon as w is less than negative two thirds. All the other options always return values between –1 and 1.
Example Question #141 : Algebra
Solve for 
Absolute value problems always have two sides: one positive and one negative.
First, take the problem as is and drop the absolute value signs for the positive side: z – 3 ≥ 5. When the original inequality is multiplied by –1 we get z – 3 ≤ –5.
Solve each inequality separately to get z ≤ –2 or z ≥ 8 (the inequality sign flips when multiplying or dividing by a negative number).
We can verify the solution by substituting in 0 for z to see if we get a true or false statement. Since –3 ≥ 5 is always false we know we want the two outside inequalities, rather than their intersection.
Example Question #4 : How To Find The Solution To An Inequality With Addition
If 
To solve this problem, add the two equations together:
The only answer choice that satisfies this equation is 0, because 0 is less than 4.
Example Question #5 : How To Find The Solution To An Inequality With Addition
What values of 
First, solve the inequality 
Since we are dealing with absolute value, 
Example Question #6 : How To Find The Solution To An Inequality With Addition
Simplify the following inequality
For a combined inequality like this, you just need to be careful to perform your operations on all the parts of the inequality. Thus, begin by subtracting 
Next, divide all of the members by 
Example Question #7 : How To Find The Solution To An Inequality With Addition
Simplify
Simplifying an inequality like this is very simple. You merely need to treat it like an equation—just don't forget to keep the inequality sign.
First, subtract 
Then, divide by 
Example Question #11 : Inequalities
The inequality 
In order to simplify an inequality, we must bring the unknown (
Example Question #161 : Equations / Inequalities
We must put all of the like terms together on either side of the inequality symbol. First, we need to subtract the 
We solve for 
That leaves us with 
Example Question #17 : Inequalities
Solve the following inequality:
To solve an equality that has addition, simply treat it as an equation. Remember, the only time you have to do something to the inquality is when you are multiplying or dividing by a negative number.
Subrtract 4 from each side. Thus,
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