Hi

solving by substitution method:

x=y-1

y=4-2x



y = 4 - 2(y-1)  |substituting for (y-1) for x

  3y = 6

   y = 2 and x = 1  (2-1)



CHECKING our Answer***

  y = 4-2x

  2 = 4  - 2 

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