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3a-4b=10 (x2)
a-8b=10
6a-8b=20
------------------ +
5a=30
a=6
substitusikan a=6 ke persamaan yang mana aja
a-8b=10
6-8b=10
6-10=-8b
b=-1/2
3a-4b=10 (x2)
a-8b=10
6a-8b=20
------------------ +
5a=30
a=6
a-8b=10
6-8b=10
6-10=-8b
b=-1/2