Question 352413
x-y=19
2x + y= 2

....
add the both equations
x+2x+y-y=19+2
3x=21
/3
x=21/3
x=7
plug the value of x in x-y =19
7-y=19
add -7
-7+7-y=19-7
-y=12
/-1
y=-12
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On observation we find that the y term can be eliminated just by adding the two equations.  hence elimination method.
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