12 Solving Systems by Substitution problems in a Google Sheet. Answer boxes are all conditionally formatted to turn green when the correct answer is entered.
The sheet asks students for the x-solution, y-solution and then a final (x,y) answer. This allows students to check their progress along the way.
The formatting allows for teachers to post to Google Classroom and grade with ease by simply looking for green boxes. It appears extremely well in Google Classroom.
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