Lesson Example Discussion Quiz: Class Homework |
Step-3 |
Title: Angles |
Grade: 1400-a Lesson: S3-L8 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
| Step | Type | Explanation | Answer |
|---|---|---|---|
1 |
Problem |
Find the value of y in (3y + 21)° and (6y – 12)°, which create a linear pair. |
|
2 |
Step |
Given angles |
(3y + 21)° and (6y – 12)° |
3 |
Step |
The sum of a linear pair of angles is 180° |
(3y + 21)°+ (6y – 12)° = 180° |
4 |
Step |
Combine like terms in the equation |
(9y – 9)° = 180° 9y = 180° – 9° 9y = 171° |
5 |
Step |
Divide both sides by 9 to solve for y |
y = \$(171°)/9\$ y = 19° |
6 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
7 |
Choice.A |
It is the correct answer because it satisfies the equation and makes the sum of the angles in the linear pair equal to 180° |
19° |
8 |
Choice.B |
Incorrect. Substituting y = 18 does not satisfy 9y + 9 = 180 |
18° |
9 |
Choice.C |
Incorrect. Substituting y = 13 does not satisfy 9y + 9 = 180 |
13° |
10 |
Choice.D |
Incorrect. Substituting y = 10 does not satisfy 9y + 9 = 180 |
10° |
11 |
Answer |
Option |
A |
12 |
SumUp |
Can you summarize what you’ve understood in the above steps? |
|
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