Question 1205381
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To learn it, substitute x= 4, y= 1 into each equation and calculate left side;

then compare with its right side.



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It is  ABSOLUTELY  UNNECESSARY to solve the system from scratch 
to check if the given pair of numbers is the solution,  as the other tutor does.


Doing this way only shows/demonstrates that a person who solves it 
EITHER  does not understand question  OR  does not know how to answer it properly.



In any case,  it is  WRONG  TEACHING.