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4x - 3y = 36
1/2 x + 1/4 y = 2 -- dikalikan 4
2x + y = 8
keduanya dieliminasi
4x-3y=36 dikali 1 4x - 3y = 36
2x + y = 8. dikali 2 4x + 2y = 16
-------------------------- -
-5y = 20
y = 20/-5 = -4
2x + (-4) = 8
2x = 12
x = 12/2 = 6
a= 6
b = -4
a-2b = 6 - 2. -4 = 6 + 8 = 14