Jawabanmu

2014-05-18T11:53:06+07:00
K = 4s 40 = 4 (12-x) 40 = 48 - 4x -8 = -4x x = 2
2014-05-18T11:58:58+07:00
K = 4xs
40 = 4(12-x)
40 = 48 - 4x
40-48= -4x
-8= -4x
2= x