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Variables in Expressions and Equations

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  • the result of a number subtracted from 10 is 4
    10 - x = 4
  • 4 divided by a number
    4/n OR 4 ÷ n
  • when a number is increased by 3 the result is 7
    x + 3 = 7
  • What is the difference between an expression and an equation?
    Equations involve EQUALS
  • the sum of 6 and a number is 15
    6 + n = 15
  • What is an equation?
    a mathematical statement of equality between two expressions
  • The result of 2 less than half of a number is 0
    x/2 - 2 = 0 OR 0.5x - 2 = 0
  • What is a variable?
    a letter or symbol that is used to represent a quantity or number
  • 7 multiplied by a number
    7n OR 7 x n
  • a number decreased by 5
    n - 5
  • a number divided by 2 is 14
    n/2 = 14 OR n ÷ 2 = 14
  • What is an expression?
    a mathematical statement that can consist of numbers, variables, and/or operations
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