**In this module you can study how to substitute given values into a formula.**

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The most common error made when substituting values into a formula is when negative signs are dropped.

You must use **Order of Operations** rules when evaluating formulas. (Remember BEDMAS)

**Study and practice**

- Systems of equations with substitutionWalk through examples of solving systems of equations with substitution.

The video explains how to use exponents on a Casio fx-991 scientific calculator. (The 'E' part of BEDMAS.)

- Online scientific calculator from Calculator.netTo open the scientific calculator in a new window, you MUST click the link.