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!
