Question 407001
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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