Question 661014
<pre>
25d -  9g =   915
 9d + 25g = -1365

Multiply the first equation through by 25
Multiply the second equation through by 9

625d - 225g =  22875
 81d + 225g = -12285

Add them term by term and get

706d        =  10590
          d = 15

Substitute in 

   9d + 25g = -1365
9(15) + 25g = -1365
  135 + 25g = -1365
        25g = -1500
          g = -60

Edwin</pre>