Question

quanto e{ 10x+6x=4; 12x-6y=18 }

Answer 1

10x+6x=4
12x-6y=18
   22x = 22
     x = 1
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10x+6x=4 ==> 6x = 4 - 10x ==> 6y = 4 - 10(1) ==> 6y= - 6 ==> y = -1