Difficulty: Easy
Correct Answer: 16°
Explanation:
Introduction / Context:
This question checks a basic geometry fact: supplementary angles add up to 180°. Once you translate the statement into an equation, it becomes a simple linear equation in y.
Given Data / Assumptions:
Concept / Approach:
Use the definition of supplementary angles:
(5y + 62) + (22 + y) = 180.
Combine like terms (y terms together and constants together), then isolate y by basic algebra.
Step-by-Step Solution:
1) Form the equation from supplementary condition:
(5y + 62) + (22 + y) = 180
2) Combine y terms: 5y + y = 6y
3) Combine constants: 62 + 22 = 84
4) So the equation becomes:
6y + 84 = 180
5) Subtract 84 from both sides:
6y = 96
6) Divide both sides by 6:
y = 16
7) Therefore y = 16°.
Verification / Alternative check:
Substitute y = 16:
Angle 1 = 5*16 + 62 = 80 + 62 = 142°.
Angle 2 = 22 + 16 = 38°.
Sum = 142° + 38° = 180°, so the condition holds exactly.
Why Other Options Are Wrong:
• 32°, 24°, 8°, 1°: substituting any of these values does not make the two expressions add to 180°.
Common Pitfalls:
• Treating supplementary as “equal” instead of “sum to 180°”.
• Forgetting to combine y terms correctly (5y + y = 6y).
Final Answer:
16°
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