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a - b = 19 _
2b = 22
b = 11
a = 30
jika ada soal seperti ini,misalkan terlebih dahulu - ----- bil.I = a II = b
kemudian rumuskan masalahnya
bilangan pertama = 11
kedua = 30
Jumlahnya x+y = 41 sedangkan selisihnya x-y = 19. Jadi...
x+y = 41 x-y = 19
x= 41-y 41-y-y = 19
41-2y = 19
-2y = 19-41
-2y = -22
y = -22 : -2
y = 11
x=41-y
x= 41-11
x= 30
Smoga benar dan bermanfaat ^^