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I don't not understand substation for this problem y=x+6 then y=2x-7

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Konrad509id
[tex]y=x+6\\ y=2x-7\\\\ x+6=2x-7\\ 2x-x=6+7\\ x=13\\\\ y=13+6\\ y=18\\\\ \boxed{(x,y)=(13,18)}[/tex]