Once you’ve determined that the equations are H + 2K = 40, and 3H - K = 1, you would do which of the following to solve?

(A) multiply the first equation by 3 and add 
     the two equations 
(B) multiply the second equation by 2 and 
      subtract the two equations  
(C) multiply the first equation by 2 and add 
      the two equations  
(D) multiply the second equation by 2 and 
      add the two equations