Question 992304
.
You need to solve this system of two equations with two unknowns:


{{{system(2x+y=5,
y=x-1)}}}.


Substitute  y  from the second equation to the first one.  You will get an equation for the single unknown x only. 


Then solve it.


Then substitute the found value of  x  into either equation of the original system to find  y.


Is it clear?


Good luck!