| Algebra I Recipe: Variables in Algebra |
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A. Definitions
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variable – any letter representing a number.
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algebraic expression – an expression having numbers and variables with operations,
such as 2x - y.
B. How to Evaluate an Algebraic Expression
- Substitute the given value in for each variable.
- Perform the operations the same as evaluating numerical expressions in Sec. 1.1.
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C. Formulas
- Interest Earned I = Prt
- Interest = Principal · rate · time
- Rate – must be in decimal form
- Time – must be in years such as 6 months = 0.5 years
- Temperature ºF = (9/5)ºC + 32
- ºF is degrees Fahrenheit
- ºC is degrees Celsius
- Distance d = rt
- distance = rate · time
- time – must be in hours such as 15 minutes = 0.25 hours
Practice Problems
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G Redden
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