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y=2
ax+by=4
-3a+2b=4
-2ax-by=2
6a-2b=2
-3a+2b=4
6a-2b=2 +
3a=6
a=6/3
a=2
mencari b
6a-2b=2
6(2)-2b=2
12-2b=2
-2b=2-12
b=-10/-2
b=5
6a-2b=2
---------------- +
3a=6
a=2
12-2b=2
b=5