1,334 prompts matching "Simultaneous equations of a line and the coordinate axes"
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Explain Back: Showing that AB and BA are usually different for 2 by 2 matrices
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WAEC Prep: Multiplying a 3 by 3 matrix by the identity matrix
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Spot My Mistake: Orders that make a product possible one way round but not the other
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Quiz: Solving AX equals B and XA equals B by different routes
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Practice: The condition on the orders for a product to exist
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Learn: Deciding whether a stated matrix calculation is possible at all
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WAEC Prep: A matrix expression with brackets to expand
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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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Spot My Mistake: Forming the determinant Dx by replacing the first column
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Worked Example: Forming the determinant Dy by replacing the second column
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Quiz: Checking an inverse by multiplying to get the identity
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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Spot My Mistake: Why the inverse must be applied on the correct side
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WAEC Prep: When the matrix method is worth the work for three unknowns
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WAEC Prep: Mass, and how it differs from weight
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Learn: Inertia, and what mass actually measures
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Quiz: Why mass stays the same wherever the body is taken
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