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(6)2/3x - (6)1/2y=(6)2
4x-3y=12
(8)1/2x + (8)1/4y=(8)4
4x+2y=32
eliminasi:
4x-3y=12
4x+2y=32
___________ -
-5y = -20
y = (-20): (-5)
y= 4
ambil salah stu persamaan
4x-3y=12
4x -3(4)=12
4x-12=12
4x=12+12
4x=24
x=24:4
x=6
karna x=a dan y=b
jadi a -2b =
6-2(4)=
6-8=
-2