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a - 2b = 3 -
2a = 2 => a=1
Substitusi a=1
a - 2b = 3
1 - 2b = 3
-2b = 2 => b= -1
Jadi, 4a + 4b = 4(1) + 4 (-1) = 0
3a-2b=5 --> 3a-2b=5
1a-2b=3 --> 3a-6b=9
lalu dikurangkan
Hasilnya : 4b=-4
b=-1
klo b dah ketemu berarti a= 6
4a+4b = -4 + 24 = 20