Question 1090976
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x + y = 25,        (1)
2x - 1 = 4y +1.    (2)


From equation (1, express u = 25-x and substitute it into equation (2).
You will get a single equation for one unknown


2x - 1 = 4*(25-x) + 1.

Simplify and solve for x:

2x - 1 = 100 - 4x + 1,

2x + 4x = 100 + 1 + 1,

6x = 102  ====>  x = {{{102/6}}} = 17.


<U>Answer</U>.  x = 17,  y = 25-17 = 8.
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Solved.