Solve Equations with Cross Products
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9 Terms
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Main concept
Solve equations with fractions using cross products Cross products mean multiplying in a criss cross pattern
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Goal
Isolate the variable x
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Inverse operations
Addition and subtraction undo each other Multiplication and division undo each other
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Golden rule
Keep the equation balanced Do the same thing to both sides
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Check answer
Substitute the value back into the equation
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Cross product rule
If a over c = b over d then a times d = c times b
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Example
5 over 6 = x over 9 → cross multiply → 5 × 9 = 6x → 45 = 6x → divide by 6 → x = 7.5
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TITLE
Solve Equations with Cross Products 9 19 25
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Note 
Flashcards (40)