Jawabanmu

2014-08-15T19:18:30+07:00
A. 2a - 4 = a + 4
2a-a = 4+4
a=8

b. 2k - 3k = 6-9
-k = -3
k = 3

maaf kalo salah :')
2014-08-15T19:25:17+07:00
2(a-2)=a+4
2a-4=a+4
2a-a=4-4
a=0

2k-6=3k-9
2k-3k=-9+6
-k=-3
k=3