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A logistics coordinator is balancing two delivery routes, xx and yy, where their combined variance from the schedule is 1-1 hour and route yy is $5hourslongerthanroutehours longer than routex$. This is represented by the system of equations:

  1. x+y=1x + y = -1
  2. y=x+5y = x + 5

According to the substitution method, to create a single-variable equation, the expression from the second equation that is substituted for yy in the first equation is ____.

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Updated 2026-04-18

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