Question

Como resolver o sistema 2x-y=13 12x-5y=18

Answer 1

  2x-y=13(-5) 
12x-5y=18

-10x + 5y = - 65 
 12x  - 5y = 18
      2x = - 47 ==> x = - 47/2
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2x - y = 13 ==> y = 2x - 13

y = 2(-47) - 13 ==> y = - 47 - 13 ==> y = - 60
           2
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2x - y = 13 ==> 2(-43/2) - (-60) ==> - 43+ 60 ==> 17