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x : y= 2 : 7
2+7=9
x= 2/9×180
= 2×20
= 40 derajat
51. (2x+5)+57= 180
2x+5+57= 180
2x+62= 180
2x= 180-62
2x= 118
x= 118/2
= 59 derajat
x/y = 2/7 --> 2y = 7x --> y = 7/2 x
x+y=180 --> x + 7/2 x = 2/2 x + 7/2 x = 9/2 x = 180 --> x = 180 (2/9) = 40
b. Sudut pelurus = 108
(2x+5)+57 = 180
2x + 62 = 180
2x = 118
x = 118/2 = 59