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20 votes
20 votes
M∠ABD=87°
m∠ABC=9x−1°
m∠CBD=6x+58

Encuentra m∠ABC

M∠ABD=87° m∠ABC=9x−1° m∠CBD=6x+58 Encuentra m∠ABC-example-1
User Kgrover
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1 Answer

11 votes
11 votes

Answer: 9x - 1 = 9(2) - 1 = 17

Explanation:

m∠ABD = m∠ABC + m∠CBD

87 = 9x -1 + 6x + 58

87 = 15x + 57

30 = 15x

2 = x

User Sipke Schoorstra
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2.6k points