Exercise 3 Page 243

Consider if $ax+b=cx+d$ was given as an equation with variables on both sides. One could form and solve the following system of linear equations. The solution to such a system can be found both algebraically and graphically. Solving algebraically, the goal would be to isolate the value of $x$ using either the Substitution Method or the Elimination Method. When solving graphically, the solution is the $x\text{-}$value of the point of intersection of the lines of both graphs.