Jawabanmu

2014-08-23T04:40:06+07:00
Eliminasi
a2 + b2 = 40
a - b = 4 (× 2)
----------
a2 + b2 = 40
a2 - b2 = 8
---------- (+)
a4 = 48
a = 12

a - b = 4
12 - b = 4
- b = - 12 + 4
- b = - 8
b = 8
2014-08-23T06:17:11+07:00