Chapter 4.1, Problem 63E

The coefficients of the three systems given below are similar. One might guess that the solution sets to the three systems would be nearly identical. Develop evidence for or against this guess by considering graphs of the systems and solutions obtained using substitution or elimination by addition.

$\begin{array}{l}\left(\text{A}\right)5x+4y=4\\ 11x+9y=4\end{array}$

$\begin{array}{l}\left(\text{B}\right)5x+4y=4\\ 11x+8y=4\end{array}$

$\begin{array}{l}\left(\text{C}\right)5x+4y=4\\ 10x+8y=4\end{array}$