Mathematics, 09.10.2019 03:20 EbonyMontricee

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. m∠bec + 30° =70°; substitution property of equality

b. m∠bec + 30° = 70°; addition property of equality

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statement justification

line bc is parallel to line ed given

m∠abc = 70° giv...