Jawabanmu

2014-02-19T20:32:06+07:00
B. 3z + 11 = -28
    3z        = -28 -11
    3z        = -39
    z          = -39
                   3
    z          = -13


2014-02-19T20:48:24+07:00
A.24m=12 m=12/24 m=1/2 atau 0.5 b.3z+11=-28 3z =-28-11 3z =-39 z =-39/3 z =-13 c.25-4y=6y+15 -4y-6y=15-25 -10y = -10 y =-10/-10 y = 1 d.-4x-15=1-8x -4x+8x=1+15 4x =16 x =16/4 x =4 e.6/a+2=4 6/a =4-2 6/a =2 6 =2xa 6/2 =a 3 = a