College Algebra / Unit 3 Alg 159 short lesson, about 20 seconds
The Addition Property of Inequality
Captions available
The idea
The addition property of inequality says adding or subtracting the same number on both sides leaves the inequality's direction unchanged.
In practice
x + 3 < 7 becomes x < 4 after subtracting 3 — and 0 satisfies both, while 5 satisfies neither.
Where people slip
Direction is the thing being protected.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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