Summary: Solving Equations Containing Decimals

Key Concepts

Determine whether a number is a solution to an equation.
- Substitute the number for the variable in the equation.
- Simplify the expressions on both sides of the equation.
- Determine whether the resulting equation is true. If so, the number is a solution. If not, the number is not a solution.
Properties of Equality

Subtraction Property of Equality	Addition Property of Equality
For any numbers $a$ , $b$ , and $c$ , $\begin{array}{cccc}\text{If}& \hfill a& =& b\hfill \\ \text{then}& \hfill a-c& =& b-c\hfill \end{array}$	For any numbers $a$ , $b$ , and $c$ , $\begin{array}{cccc}\text{If}& \hfill a& =& b\hfill \\ \text{then}& \hfill a+c& =& b+c\hfill \end{array}$
Division of Property of Equality	Multiplication Property of Equality
For any numbers $a$ , $b$ , and $c\ne 0$ , $\begin{array}{cccc}\text{If}& \hfill a& =& b\hfill \\ \text{then}& \hfill \frac{a}{c}& =& \frac{b}{c}\hfill \end{array}$	For any numbers $a$ , $b$ , and $c$ , $\begin{array}{cccc}\text{If}& \hfill a& =& b\hfill \\ \text{then}& \hfill a\cdot c& =& b\cdot c\hfill \end{array}$

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