Unit 1: Quantities and Modeling
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21 Terms
1
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constant
A value that does not change
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Variable
A symbol used to represent a quantity that can change
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Coefficient
A number is multiplied by a variable in an algebraic expression.
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algebreic expression
A combination of variables, numbers, and at least one operation.
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ratio
A comparison of two quantities by division
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proportion
an equation that states that two ratios are equal
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scale
the ratio of any length in a scale drawing or scale model to the corresponding actual length
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scale drawing
a drawing that is the same shape as the object it represents
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scale model
a model used to represent an object that is too large or too small to be built at the actual size
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rate
A ratio that compares two quantities measured in different units
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conversion factor
a ratio of equivalent measurements
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numerical expression
An expression that contains only numbers and operations
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equivalent expressions
Expressions with the same value
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Literal Equations
equations that contain two or more variables and sometimes no numbers at all
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compound statement
two or more statements joined by the word "and" or "or"
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intersection
the point at which two lines or roads meet and cut across each other
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union
combined region, of the simple inequality graphs
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less than
Less than is used to compare two numbers when the first number is smaller than the second number.
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less than or equal to
≤
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more than
>
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more than or equal to
greater than or equal to
