9) In the diagram, PQR is a straight line. Which of the following is incorrect ? ( A ) y - x = 60 ° ( B ) x = 40 ° ( C ) y + z = 200 ° ( D ) x + y + z = 220 ° Share with your friends Share 2 Neha Sethi answered this Dear student Since l is parallel to m and SQ is a transversal∠S+x°=180° co interior angle⇒x=180°-140°x=40°Now, ∠PQS+x°+y°=180° linear pair⇒40°+40°+y°=180°⇒y°=100°So, y°-x°=100°-40°=60° Now assuming Q and R to be parallelSo, y°=z°=100° alternate interior angleSo, y°+z°=200° Also x°+y°+z°=40°+100°+100°=240°≠220°So, D option is incorrect Regards 2 View Full Answer Jasuvant answered this 1)60 2)40 3)100 4)80 -1