Answer:
Supplementary Angles Theorem
Explanation:
The sum of m∠1 + m∠2 = 180°
x + 10 + 3x + 18 = 180 (Set up equation)
4x + 28 = 180 (Simplify the left side)
4x = 152 (Subtract 28 from both sides)
x = 38° (Divide both sides by 4)
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