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a). y= ¾ x --> 3x = 4y sub ke 2y =3x -12
2y = 4y -12
- 2 y = -12
y = 6 dan x = 8
b). y= -½ x --> x = - 2y sub ke 3y + 2x = 6
3y + 2( -2y) = 6
-y = 6
y = - 1 dan x = 2