Algebra 1 - Relationships Between Quantities

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Algebra

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The branch of mathematics that deals with operations on sets of numbers and relationships between them.

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Equation

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A statement that describes the equality of two expressions by connecting them with an equals sign.

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Function

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A kind of relation in which one variable uniquely determines the value of another variable.

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Linear Equation

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An equation that describes a straight line.

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Coefficient

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Number used to multiply a variable.

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Factor

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Number you multiply by to get another number.

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Variable

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A symbol that represents an unknown value.

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Scale

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The spacing of numbers on the axes of a graph.

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Units of Measurement

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A quantity used as a standard of measurement. (Example: Units of time are second, minute, hour, day, week, month, year and decade.)

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Unit Rates

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The rate of one item. (Example: 1 foot = 12 inches)

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Modeling

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Using a picture, equation, or system of equations to represent real-world phenomena. Models also represent patterns found in graphs and/or data. Usually models are not exact matches the objects or behavior they represent. A good model should capture the essential character of whatever is being modeled.

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Quantity

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The amount of something.

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Proportion

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The result of dividing one number or expression by another. Sometimes a ratio is written as a proportion, such as 3:2 (three to two). More often, though, ratios are simplified according to the standard rules for simplifying fractions or rational expressions.

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Precision

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The level of detail in a number or estimate. A precise number has many significant digits. Note: An answer may be precise without being accurate. (Example: Numerous shots at a bulls eye being in the same area (not necessarily near the bulls eye).)

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Accuracy

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How close an approximation is to an actual value. (Example: Numerous shots at a bulls eye being near the center of the bulls eye but not necessarily around each other.)