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5y - 16 + 2y = 180
7y - 16 = 180
7y = 196
y = 196 : 7
y = 28
maka
<A = 5y - 16 = 5(28) - 16 = 140-16 = 124 derajat
sudut A = (5y - 16 )°
sudut B = 2y°
jawab :
sudut A + sudut B = 180°
(5y - 16 )° + 2y° = 180°
5y° - 16° + 2y° = 180°
5y° + 2y° = 180° + 16°
7y° = 196°
y°= 196°/7
y° = 28°
sudut A = ( 5y -16 )
sudut A = ( 5( 28 ) - 16 )
sudut A = ( 140 - 16 )
sudut A = 124°
sudut B = 2y
sudut B = 2(28 )
sudut B = 56°
jadi besar sudut A dan B adalah 124° dan 56°
semoga benar dan jika salah mohon maaf