1,334 prompts matching "Cross-multiplying to solve an equation with fractions"
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WAEC Prep: Multiplying every entry of a matrix by a scalar
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Quiz: Solving AX equals B and XA equals B by different routes
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WAEC Prep: The transpose of a transpose
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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WAEC Prep: The determinant of the identity matrix
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Learn: The effect on a determinant of swapping two rows
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WAEC Prep: Expanding a 3 by 3 determinant down a column
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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WAEC Prep: When Cramer's rule is quicker than elimination
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Spot My Mistake: Forming the determinant Dx by replacing the first column
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WAEC Prep: The determinant Dz in a system of three unknowns
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WAEC Prep: The cofactor of a corner entry
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WAEC Prep: Why the cofactor signs alternate
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WAEC Prep: The inverse of an inverse
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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WAEC Prep: Reading the solution off the product of the inverse and the constants
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Practice: What a singular coefficient matrix says about the equations
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Worked Example: Checking the solution of three equations by substitution
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WAEC Prep: A particle, and what the word assumes
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