OH.PFA. Patterns, Functions and Algebra: Students use patterns, relations and functions to model, represent and analyze problem situations that involve variable quantities. Students analyze, model and solve problems using various representations such as tables, graphs and equations.
PFA.C. Write and solve open sentences and explain strategies.
PFA.D. Represent an unknown quantity as a variable using a symbol, including letters.
PFA.E. Use variables to create and solve equations representing problem situations.