Isolate, Then Split
Part of the Inequalities & Absolute Value section of Coddy's Math journey. Lesson 52 of 64.
As with equations, the bars must be alone before the split. 2|x| + 1 > 7: subtract 1, divide by 2, and only then split.
2|x| > 6
|x| > 3
Now split: x > 3 or x < -3.
The same for a "less than": |x - 3| - 1 <= 1 needs the 1 added back first, |x - 3| <= 2, and then the chain -2 <= x - 3 <= 2, so 1 <= x <= 5. Isolate, decide whether it is a "less than" (chain) or a "greater than" (or), split, solve.
Challenge
Solve the inequality |x - 3| - 1 <= 1 for x.
Try it yourself
Solve for x
This lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Inequalities & Absolute Value
1What an Inequality Is
The Four SignsA Picture on a LineClosed or OpenReading It BackwardsRecap: What an Inequality Is4Two-Step Inequalities
Two StepsSubtract, Then FlipWith a FractionA Bracket on the WayRecap: Two-Step Inequalities7Between Two Numbers
Two Conditions at OnceSolving a ChainTwo Moves on All PartsWhen the Chain FlipsChains with FractionsRecap: Between Two Numbers10Absolute Value Inequalities
Less Than: BetweenBetween, ShiftedGreater Than: OutsideOutside, ShiftedIsolate, Then SplitAlways or NeverRecap: Absolute Inequalities2Adding and Subtracting
Add to Both SidesSubtract from Both SidesNegatives in the MixSolve, Then DrawRecap: Adding and Subtracting5Variables on Both Sides
x on Both SidesGather Toward the LargerBrackets FirstAlways True, Never TrueRecap: Variables on Both Sides11From Words to Inequalities
At Least, At MostMore ThanA Budget That ShrinksTwo LimitsRecap: From Words3Multiplying and Dividing
Divide by a PositiveMultiply by a PositiveThe FlipDividing by a NegativeNegative FractionsRecap: Multiply and Divide6Graphing Solutions
From Inequality to PictureIs the Endpoint In?A Flip on the LineRecap: Graphing Solutions