Question 1110996
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This system of equations is the simplest example of the system of 2 equations in two unknowns.


In addition, it is the MOST POPULAR example.


When you see such a system, add the two equations MOMENTARILY / immediately / INSTANTLY.


You will get 

2x = 16 + 26 = 42  ====>  x = {{{42/2}}} = 21.


Half of the solution is just DONE.


Now from either of the two original equations find y.


For example, from the first equation  y = 16 - 21 = -5.


<U>Answer</U>.  x= 21,  y = -5.
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The solution is completed.