Introductory%20Algebra%20Glossary

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Introductory Algebra Glossary

• Unit Two

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linear equation in one variable

• A linear equation in one variable can be written
  in the form ax b, where a and b are real
  numbers, with a ? 0.

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solution set

• The set of all solutions of a particular
  equation.

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equivalent equations

• Equations that have the same solution set.

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empty set (null set)

• The set containing no elements, denoted by or
  Ø.

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degree

• A degree is a basic unit of measure for angles in
  which one degree (1) is 1/360 of a complete
  revolution.

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complementary angles (complements)

• Complementary angles are angles whose measures
  have a sum of 90.

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supplementary angles (supplements)

• Supplementary angles are angles whose measures
  have a sum of 180.

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consecutive integers

• Two integers that differ by one.

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perimeter

• The measure of the distance around the outside
  edges of a two-dimensional figure, the sum of the
  lengths of its sides.

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circumference

• The distance around a circle.

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area

• A measure of the surface covered by a
  two-dimensional figure.

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vertical angles

• The angles that lie opposite each other when two
  lines intersect.

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straight angle

• A straight angle measures 180.

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ratio

• A comparison of two quantities with the same
  units
• 3 to 4, 34 and 3/4 are all equivalent
  expressions of the same ratio.

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proportion

• A statement that two ratios are equal
• 12 24

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cross products

• In the proportion a/b c/d, the cross products
  are ad and bc.

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vary directly as (is proportional to)

• y varies directly as x if there exists a nonzero
  number k such that y kx.

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interval notation

• A simplified notation which uses parentheses, (
  ), and/or brackets, , to describe an
  intervalon a number line.

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three-part inequality

• An inequality that says that one number is
  between two other numbers.

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Return to Introductory Algebra

• Created by
• James Q. Jacobs