Two equations with two to-be-solved unknown variables:
First equation: y=2(x+3)
Second equation:y=2(x−1)
From 1st−equation: x=12y−3
This yields for the second equation: y=y−2!
Consequently, both equations contradict one-another and can NOT be both valid simultaneously!
I.e. these two (x, y) equations can NEVER be solved with EASY linear Mathematical-Analyses, because the two equations require different so-called Boundary Conditions to solve the two polynomials Correctly!
As a result the required substitution of y(x) or x(y) can NOT be analysed here!
