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2. Essential Questions
How do you solve and graph inequalities on a
number line?
How do you solve problems involving
inequalities?
Where you’ll see this:
Communications, health, fitness, hobbies,
safety, business
4. Vocabulary
1. Solve an Inequality: Find all values that make the
inequality true
2. Addition Property of Inequality:
5. Vocabulary
1. Solve an Inequality: Find all values that make the
inequality true
2. Addition Property of Inequality:
6. Vocabulary
1. Solve an Inequality: Find all values that make the
inequality true
2. Addition Property of Inequality:
If a < b, then a + c < b + c
7. Vocabulary
1. Solve an Inequality: Find all values that make the
inequality true
2. Addition Property of Inequality:
If a < b, then a + c < b + c
If a > b, then a + c > b + c
8. Vocabulary
1. Solve an Inequality: Find all values that make the
inequality true
2. Addition Property of Inequality:
If a < b, then a + c < b + c
If a > b, then a + c > b + c
If you add to one side of an inequality, you add to
the other
11. Vocabulary
3. Multiplication and Division Properties of Inequality:
If a < b and c > 0, then ac < bc
If a > b and c > 0, then ac > bc
12. Vocabulary
3. Multiplication and Division Properties of Inequality:
If a < b and c > 0, then ac < bc
If a > b and c > 0, then ac > bc
If a < b and c < 0, then ac > bc
13. Vocabulary
3. Multiplication and Division Properties of Inequality:
If a < b and c > 0, then ac < bc
If a > b and c > 0, then ac > bc
If a < b and c < 0, then ac > bc
If a > b and c < 0, then ac < bc
14. Vocabulary
3. Multiplication and Division Properties of Inequality:
If a < b and c > 0, then ac < bc
If a > b and c > 0, then ac > bc
If a < b and c < 0, then ac > bc
If a > b and c < 0, then ac < bc
This is the same for division!
15. Vocabulary
3. Multiplication and Division Properties of Inequality:
If a < b and c > 0, then ac < bc
If a > b and c > 0, then ac > bc
If a < b and c < 0, then ac > bc
If a > b and c < 0, then ac < bc
This is the same for division!
This means that if we multiply or divide by a negative,
we have to flip the sign.
16. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
17. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7
18. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7
−n ≤ −2
19. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7
−n ≤ −2
−1 −1
20. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7
−n ≤ −2
−1 −1
n≥2
21. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7
−n ≤ −2
−1 −1
n≥2
-3 -2 -1 0 1 2 3 4 5
22. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7
−n ≤ −2
−1 −1
n≥2
-3 -2 -1 0 1 2 3 4 5
23. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7
−n ≤ −2
−1 −1
n≥2
-3 -2 -1 0 1 2 3 4 5
24. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7 +4 +4
−n ≤ −2
−1 −1
n≥2
-3 -2 -1 0 1 2 3 4 5
25. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7 +4 +4
−n ≤ −2 13x > 26
−1 −1
n≥2
-3 -2 -1 0 1 2 3 4 5
26. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7 +4 +4
−n ≤ −2 13x > 26
−1 −1 13 13
n≥2
-3 -2 -1 0 1 2 3 4 5
27. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7 +4 +4
−n ≤ −2 13x > 26
−1 −1 13 13
n≥2 x >2
-3 -2 -1 0 1 2 3 4 5
28. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7 +4 +4
−n ≤ −2 13x > 26
−1 −1 13 13
n≥2 x >2
-3 -2 -1 0 1 2 3 4 5 -3 -2 -1 0 1 2 3 4 5
29. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7 +4 +4
−n ≤ −2 13x > 26
−1 −1 13 13
n≥2 x >2
-3 -2 -1 0 1 2 3 4 5 -3 -2 -1 0 1 2 3 4 5
30. Example 1
Solve and graph each inequality.
a. 7 − n ≤ 5 b. 13x − 4 > 22
−7 −7 +4 +4
−n ≤ −2 13x > 26
−1 −1 13 13
n≥2 x >2
-3 -2 -1 0 1 2 3 4 5 -3 -2 -1 0 1 2 3 4 5
31. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
32. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4
33. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4
x ≤ −4
34. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4
x ≤ −4
-7 -6 -5 -4 -3 -2 -1 0 1
35. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4
x ≤ −4
-7 -6 -5 -4 -3 -2 -1 0 1
36. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4
x ≤ −4
-7 -6 -5 -4 -3 -2 -1 0 1
37. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4 −3 −3
x ≤ −4
-7 -6 -5 -4 -3 -2 -1 0 1
38. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4 −3 −3
−2x ≤ 5
x ≤ −4
-7 -6 -5 -4 -3 -2 -1 0 1
39. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4 −3 −3
−2x ≤ 5
x ≤ −4 −2 −2
-7 -6 -5 -4 -3 -2 -1 0 1
40. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4 −3 −3
−2x ≤ 5
x ≤ −4 −2 −2
5
x≥−
2
-7 -6 -5 -4 -3 -2 -1 0 1
41. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4 −3 −3
−2x ≤ 5
x ≤ −4 −2 −2
5
x≥−
2
-7 -6 -5 -4 -3 -2 -1 0 1 -3 -2 -1 0 1
42. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4 −3 −3
−2x ≤ 5
x ≤ −4 −2 −2
5
x≥−
2
-7 -6 -5 -4 -3 -2 -1 0 1 -3 -2 -1 0 1
43. Example 1
Solve and graph each inequality.
c. − 4x ≥ 16 d. − 2x + 3 ≤ 8
−4 −4 −3 −3
−2x ≤ 5
x ≤ −4 −2 −2
5
x≥−
2
-7 -6 -5 -4 -3 -2 -1 0 1 -3 -2 -1 0 1
46. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
47. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
48. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
39 + .42m
49. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
39 + .42m ≤ 80
50. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
39 + .42m ≤ 80
−39 −39
51. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
39 + .42m ≤ 80
−39 −39
.42m ≤ 41
52. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
39 + .42m ≤ 80
−39 −39
.42m ≤ 41
.42 .42
53. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
39 + .42m ≤ 80
−39 −39 13
.42m ≤ 41 m ≤ 97
.42 .42 21
54. Example 2
Matt Mitarnowski’s Rentals charges $39 per day, plus
$.42 per mile driven. If Fuzzy Jeff rents a car for one
day, what possible distances can he drive and keep his
total rental charge to a maximum of $80?
m = # miles
39 + .42m ≤ 80
−39 −39 13
.42m ≤ 41 m ≤ 97
.42 .42 21
Jeff can drive up to 97 miles.