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x+6 = y => -x+y = 6
x+y = 20
-x+y = 6
________
2y = 26
y = 13
x= 7
x(y) = 13 x 7 = 91
a = 6 + b
a + b = 20
(6 + b) + b = 20
6 + 2b = 20
2b = 20 - 6
2b = 14
b = 14/2
b = 7
a = 6 + 7
a = 13
maka hasil kali a dan b = 13 x 7 = 91