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bilangan kedua = b
a + b = 20
b + 6 + b = 20
2b + 6 = 20
2b = 20-6
2b = 14
2b : 2 = 14 : 2
b = 7
maka
a = b + 6 = 7 + 6 = 13
b = 7
hasil kali
a x b
13 x 7 = 91
x+y=20 hasil kali kedua bil=
(6+y)+y=20 x+y=20
6+2y=20 x+(7)=20
2y=14 x=13
y=7
x. y=13 x7
=91
Maaf ya kalau salah