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< ACB = 1/2 < AOB = 35°
< ADB = 1/2 < AOB = 35°
maka ,
2x + y = 35 | × 5 = 10x + 5y = 175
-4x + 5y=35 | × 1 = - 4x + 5y = 35 -
14x = 140
x = 140/14
x = 10
subtitusi x = 10 ke 2x + y = 35 untuk dapat y
2( 10) + y = 35
20 + y = 35
y = 35 - 20
y = 15
jadi nilai x + y = 10 + 15 = 25.