In order to introduce solving systems by substitution, we did these guided notes and practice activity. First, I introduced three new vocab words and the procedure. Then we did a guided example, a partner example, and worked on independent Tic-Tac-Toe Practice. in my classroom the first to get done with each type of tic-tac-toe (vertical, horizontal, diagonal) gets a class reward ticket but you could also use candy / whatever you like to incentivize a little competition!
All definitions and procedural information necessary is found on the third page! This is ready to print and teach substitution in your classroom!