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6x + 9y = 36
6x-4y = 10
........................-
13y = 26
y=2 .
kembali ke persamaan awal untuk mencari nilai x
2x+3y=12
2x+6=12
2x=6
x=3
.. ax+by=16
3a+2b=16. (1)
3a-2b=8. (2)
..........................-
4b=8
b=2
3a+2b=16
3a+4=16
3a=12
a=4
a-b=.....
4-2= 2