Question 430501
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Hi
If there is no typo on the 1st EQ
  x + 3x = 5  Or x = 5/4
 -2x + y = 4
 -2(5/4) + y = 4
  -5/2 + y = 4
         y = 6 1/2 or 6.5

CHECKING our Answer***
  -2x + y = 4
  -2.5 + 6.5 = 4