Question

M∠ABD=87°
m∠ABC=9x−1°
m∠CBD=6x+58

Encuentra m∠ABC

Answer 1

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