PSAT Math : How to find the solution to an inequality with addition
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Example Question #1 : How To Find The Solution To An Inequality With Addition
What values of x make the following statement true?
|x – 3| < 9
6 < x < 12
–6 < x < 12
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 #2 : How To Find The Solution To An Inequality With Addition
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|0.5
3w/2
|w|
w2
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 #4 : How To Find The Solution To An Inequality With Addition
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 #3 : 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 #1 : How To Find The Solution To An Inequality With Addition
If 
-
In order to solve this inequality, you must isolate 
Therefore, the only option that solves the inequality is 
Example Question #4 : How To Find The Solution To An Inequality With Addition
What values of 
First, solve the inequality 
Since we are dealing with absolute value, 
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