Question 1092360
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2x - y = 4,    (1)
 x + y = 5.    (2)


Add the two equations. The "y"-s will cancel and you will get a single equation for only one unknown x:

2x + x = 4 + 5 = 9  ====>  3x = 9  ===>  x = {{{9/3}}} = 3.


Thus you just found one unknown, x. It is 3.


Next, to find y, substitute x= 3 into equation  (2) and get

y = 5 - x = 5 - 3 = 2.


<U>Answer</U>. The solution is xx = 3,  y = 2.
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Solved.


It is how the Elimination method works.