As 75°and z forms LINEAR pair,75°+z=180°Z=180°-75°=105°.....As DC is parallel to AB,X=75°(CORRESPONDING ANGLES).....Also in quadrilateral ABCD, SUM of all angles=360°=>z+z+x+y=360°=>y=360°-(2×105°+75°)=360°-290°=>y=70°...
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