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= 3x-x+ y-6y= 23
x = -4 dab y=-7
x + 6y = 23 ... ( 2 )
( 2 ) . 3
3x + 18y = 69 ... ( 3 )
( 1 ) - ( 3 )
- 19y = - 57
y = 3
3x - y = 12
3x - 3 = 12
3x = 12 + 3
3x = 15
x = 5
x = 5 dan y = 3 ( B )