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x-y=3
x+y=11
x-y=3
x=3+y
x+y=11
3+y+y=11
3+2y=11
2y=11-3
2y=8
y=4
x=3+y=3+4=7
7.4=28
Semoga membantu!
bil kedua = b
a-b = 3
a = 3+b
a+b = 11
(3+b)+b = 11
3+2b = 11
2b = 8
b = 4
a+b = 11
a+4 = 11
a = 7
a x b = 4 x 7
= 28