L O.

asked • 05/31/14

help with determinants

Did I do this correctly?
 
use determinants to dtermine the number of solutions for each of the following and DO NOT solve the systems.
 
 
a.      3x -  y =  7
        6x - 2y =  10
 
 
       3   1
                  =    6 - 6 = 0 = 0
 
       6   2
 
      answer is one solution
 
 
b.  3x - y =  -6
 
         2x  =  3y + 2
 
 
      3     1
                     =   6 - 4 = 2 ≠ 0
      3      2
 
 
     answer is no solution
 
 
thanks

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