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(1/2) x +(1/4) y = 4 --> kalikan 4 --> 2x + y = 16 ....(2)
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(1) dan (2) dieliminasi
4x - 3y = 12
2x +y = 16......(kalikan 2
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4x - 3y = 12
4x +2y = 32
-----------(-)--
-5y = - 20
y = 4
2x + y = 16
2x + 4 = 16
2x = 12
x = 6
a = x = 6
b = y= 4
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nilai a - 2b = 6 - 2(4) = 6 - 8 = - 2