Lesson extension: http://auhsdmath.pbworks.com/w/file/fetch/60111610/TD_Day%205_solv_lin_equ_N%284%29.pdf
Lesson extension #2: http://auhsdmath.pbworks.com/w/file/fetch/60111893/TD_Day6_solv_lin_equ_N%283%29.pdf
Lesson extension #3: http://auhsdmath.pbworks.com/w/file/60111969/TD_Day_7_solv_lin_equ_N%283%29.pdf