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2.pake eliminasi dan substitusi.
6y-4x= -12
6y= 4x-12
y= ( 4x-12 )/ 6
2. 3/4 x - 1/2 y =6 pers 1
1/2 x + 5/3 y = -8 pers 2
eliminasi persamaan 1 dan 2
3/4 x - 1/2 y = 6 x 1/2
1/2 x + 5/3 y = -8 x 3/4
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3/8 x - 1/4 y = 3
3/8 x + 15/12y = -6
----------------------------- -
-3-15 /12 y= 9
-18/12 y= 9
y= 9/ (-18/12)
y= -6
subtitusi nilaiy =-6 kepers 1
3/4 x - 1/2 y = 6
3/4 x + 3 =6
3/4x= 3
x= 4
maka nilai x + 3y= 4 - 6 = -2
maaf kalau salah