Seudónimo Seudónimo
  • 12-01-2017
  • Mathematics
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Solve the system of the linear equation by adding or subtracting.

6x+y=13
3x+y=4

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antonio9990
antonio9990 antonio9990
  • 12-01-2017
6x+y=13       / *(-1) 
3x+y=4
-------------
-6x-y= -13
3x+y = 4
========== + + + 
-3x / = -9
x=2

x=2 => 3x+y=4
            3*2 + y=4
            6+y=4
             y=4-6
             y= - 2 
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