
12/8- Quizizz- Inequalities
Presentation
•
Mathematics
•
9th - 12th Grade
•
Practice Problem
•
Medium
Cesar Gomez
Used 4+ times
FREE Resource
7 Slides • 7 Questions
1
2
What is an inequality?
3
Remember when we solved equations we isolated the variable on one side by using inverse operations. You will solve inequalities the same way you solve equation. The only difference in them will be the symbol used.
4
Equations
Have an = sign
Only have one answer when solved
Inequalities
Don't have and = sign instead use inequality symbols
< (less than)
> (greater than)
≤ (less than or equal to)
≥ (greater than or equal to)
Can have multiple answers when solved
5
6
Multiple Choice
Solve the following inequality:
x + 2 > 12
subtract 2 from both sides and your answer is
x = 10
subtract 2 from both sides and your answer is
x > 10
subtract 2 from both sides and your answer is
X < 10
7
Multiple Choice
Solve 5x > 10
divide by 5 on both sides and your answer is
x = 2
divide by 5 on both sides and your answer is
x < 2
divide by 5 on both sides and your answer is
x > 2
8
Multiple Choice
Solve 3x + 2 > 8
subtract 2 from both sides and your answer is
x > 6
subtract 2 from both sides and your answer is
x = 6
subtract 2 from both sides and then divide by 3 on both sides and your answer is
x > 2
9
Multiple Choice
Solve the inequality
3x - 7 < 5
x < 4
x < -2
x = 4
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(ex) Solve -4x > -12
Divide both sides by -4, and because we are dividing by a negative number, we must reverse the inequality sign
⇒ -4x/-4 < -12/-4
⇒ x < 3
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Multiple Choice
Try some:
-2x ≤ 4
divide by -2 o both sided and your answer will be
x = -2
divide by -2 on both sides and you will switch the direction of the inequality since you are dividing by a negative and your answer will be
x ≥ -2
divide by -2 on both sides and your answer will be
x ≤ -2
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Multiple Choice
- 3x < -12
divide both sides by -3 and your answer is
x < 4
x = 4
divide both sides by -3 and your answer is
x > 4
because you divided by a negative and had to flip the inequality symbol
13
Multiple Choice
−2x≥3
multiply both sides by -2 and your answer will be
x ≤ -6
because you multiplied by a negative you must switch the inequality
multiply both sides by -2 and your answer will be
x ≥ -6
divide both sides by -2 and you get
x ≥ -2/3
14
-The inequalities that contains the equal signs are closed circles when modeling on the number line.
-The inequalities without the equal sign are open circles when modeling on the number line.
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