Systems of Linear Equations: Two Variables · Exercise 58

Solve each system in terms of $A,B,C,D,E,$ and $F$ where $A–F$ are nonzero numbers. Note that $A\ne B$ and $AE\ne BD.$

$\begin{array}{c}Ax+By=C\\ x+y=1\end{array}$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §11.1 Systems of Linear Equations: Two Variables · Exercise 58