only question in the given photos
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as we know
a+b=180°(linear pair)
2y+X=180°
2y=180°-42°
2y=138°
Y=138°/2
Y=69°
a+b=180°(linear pair)
2y+X=180°
2y=180°-42°
2y=138°
Y=138°/2
Y=69°
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