ms. drake 7th grade math number theory lesson 20 solving equations by adding or subtracting
TRANSCRIPT
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Ms. Drake 7th grade Math
Number Theory
Lesson 20Solving Equations by Adding or Subtracting
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Number TheoryAddition Property of EqualityAlgebraic ExpressionBaseCoefficientComposite Number ConstantDivision Property of EqualityEquation
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EvaluateExponentGreatest Common Factor (GFC)Inverse OperationsIsolate the VariableLeast Common Multiple (LCM)Like Terms
Number Theory
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Number Theory
SolveStandard FormSubtraction Property Of EqualityTermVariableVerbal Expression
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Number TheoryMultipleMultiplication Property of EqualityNumerical ExpressionOrder of OperationsPowerPrime FactorizationPrime NumberScientific NotationSolution
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Solving an equation is like balancing a scale. If you add
the same weight to both sides of the scale it will remain
even.
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Think of the equation x - 7 = 12
as a balance scale.The equal sign keeps
the balance, so whatever you do to
one side of the equation you must do to the other side
of the equation.
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Isolate the VariableGet the variable alone on one side of the equation.
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x – 7 = 12x – 7 + 7 = 12 + 7
x + 0 = 19 x = 19
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y + 8 = 14
y + 8 – 8 = 14 – 8 y + 0 = 6 y = 6
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To solve an addition problem use subtraction.
To solve a subtraction problem use addition.
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Let’s do a few examples.
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…Until next time try these problems.