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x+y = 3 I*2I ===============> 2x + 2y= 6
5x = -1 maka x=-1/5
sehingga y = 3 +1/5 = 16/5
15. 6^(x-2y) = 6^(-3) ===============> x-2y = -3
4^(x-y) = 4^4 ===============> x- y = 4
-y = -7 maka y = 7
sehingga x = 4 +7 = 11