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It is not because when you plug x=2 and y=4 into the second equation, it is not a true statement. In order for the ordered pair to apply to the system, there needs to be a true statement for BOTH equations not just the first one.
Observe:
2-2(4)=-6 -6=-6 this is a true statement
3(2)-2(4)=12 6-8=12 -2≠12 this is a false statement
Therefore the solution 2,4 doesn’t apply to the system since it only applies to one of the equations
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