Question 391189
x-y=1
x=1/2y+2
---------
2x - 2y = 2
2x = y + 4
Sub for 2x in the 1st eqn
y+4 - 2y = 2
-y = -2
y = 2
--------
x-y = 1
x-2 = 1
x = 3
-----------
It's a problem, not a doctoral dissertation.