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Create equations in two or more variables to represent relationships between quantities; graph equations on coordinate axes with labels and scales.
Represent constraints by equations or inequalities, and by systems of equations and/or inequalities, and interpret solutions as viable or non-viable options in a modeling context.
Rearrange formulas to highlight a quantity of interest, using the same reasoning as in solving equations.
Create equations and inequalities in one variable including ones with absolute value and use them to solve problems.