Report copyright - CHAPTER Parallel and Perpendicular Lines 3 x Solutions Key · 4. (6x)° + (3x + 9)° = 180° 9x + 9 = 180 9x = 171 x = 19 m∠CBY = 3x + 9 = 3(19) + 9 = 66° 5. 5x + 6y = 94 _____4x
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