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a+c = 1.....................1
2a+b+6c = 0..............2
3a-2b = -3.................3
eliminasi c dari pers 1 dan 2:
6a+6c = 6
2a+b+6c = 0 (-)
4a-b = 6...............................................4
eliminasi a dari persamaan 3 dan 4:
12a - 8b = -12
12a - 3b = 18 (-)
-5b = -30
b = 6
b = 6 ; b = 1/y
1/y = 6
y = 1/6