1,334 prompts matching "IGCSE Additional Maths Y11: Finding the ratio in which two lines cut one another"
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Worked Example: Forming the determinant Dy by replacing the second column
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WAEC Prep: The determinant Dz in a system of three unknowns
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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Explain Back: What a coefficient determinant of nought says about the system
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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WAEC Prep: The minor of an entry of a 3 by 3 matrix
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Practice: Turning a minor into a cofactor with the sign rule
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Explain Back: Writing out the full matrix of cofactors
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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WAEC Prep: The adjoint of the identity matrix
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WAEC Prep: The order in which the cofactors are transposed
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WAEC Prep: The adjoint as the transpose of the matrix of cofactors
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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WAEC Prep: The inverse of a 2 by 2 matrix with a fractional determinant
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WAEC Prep: The inverse of an inverse
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WAEC Prep: The inverse of a 2 by 2 matrix as one over the determinant times the adjoint
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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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WAEC Prep: How long the inverse of a 3 by 3 matrix takes, and how to shorten it
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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