Algebra I
If graphing isn't an option, another way we can solve systems of equations is with a method called substitution. Solving by substitution works by substituting one equation into another.
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What are Systems of Equations
Solve by Graphing
Solve by Substitution
Opposite Coefficients
Eliminate with Addition
Eliminate with Subtraction
Eliminate with Multiplication
Deciding on Techniques
Independent/Dependent Systems
Consistent/Inconsistent Systems
What are Systems of Inequalities
Solve Systems of Inequalities by Graphing
Solve Systems of Inequalities by Plugging In