Jawabanmu

2014-01-11T19:05:37+07:00
1)  5= a/12
     5 * 12 = a ----> pindah ruas
     60 = a
2) -15 = b/-6
    -15 * -6 = b
      90 = b


2014-01-11T19:06:38+07:00
1. 5= a/12
5 x 12 = a
60 = a

2. -15 = b/-6
-15 x -6 = b
90 

NB : Minus (-) dikali Minus = Plus (+)

semoga membantu :^)