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One-Step Equations with Multiplication. November 14, 2011. BFF and Enemy Rules. BFF Same signs  positive Positive ÷ positive Negative ÷ negative Example: -25 ÷ -5 = 5 Enemy Different signs  negative Positive ÷ negative Negative ÷ positive

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One step equations with multiplication

One-Step Equationswith Multiplication

November 14, 2011


Bff and enemy rules
BFF and Enemy Rules

  • BFF

    • Same signs  positive

    • Positive ÷ positive

    • Negative ÷ negative

      • Example: -25 ÷ -5 = 5

  • Enemy

    • Different signs  negative

    • Positive ÷ negative

    • Negative ÷ positive

      • Example: -25 ÷ 5 = -5


  • Solving multiplication problems
    Solving Multiplication Problems

    • Get x by itself

    • Use the inverse operation

    • Check with substitution

    Example:

    -15x = 30 x is not alone

    -15x = 30 use division to

    -15 -15 to solve

    x = -2

    -15(-2) = 30 Substitution




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