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1(x-y) = b
.
3a + 4b = 5 ......kali 4
12a - 3b = 1......kali 1
.
12 a + 16 b = 20
12a - 3b = 1
kurangkan
19b = 19 --> b = 1
dan 3a + 4b = 5 ---> 3a = 5-4b
3a = 5-4 --> 3a = 1 --> a = 1/3
..
untuk a =1/3 --> x+y = 3
untuk b = 1 --> x-y = 1
jumlahkan --> 2x = 4 maka x = 2
dan x +y = 3 maka y = 3-x = 1
..
HP (x,y) = (2,1)