A. m∠BEC + 30° = 70°; Substitution Property of Equality
B. m∠BEC + 30° = 70°; Addition Property of Equality
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Home » Mathematics » Statement Justification line BC is parallel to line ED Given m∠ABC = 70° Given m∠CED = 30° Given m∠ABC = m∠BED Corresponding Angles Theorem m∠BEC + m∠CED = m∠BED Angle Addition Postulate (missing) m∠BEC = 40° Subtraction Property of Equality A.