1,334 prompts matching "Teach me solving a linear and a quadratic equation by substitution"
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WAEC Prep: The identity matrix, and what it does in a product
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Worked Example: A singular matrix, and why it has no inverse
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WAEC Prep: The order of a matrix formed from a table of data
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WAEC Prep: A matrix expression with brackets to expand
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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WAEC Prep: When Cramer's rule is quicker than elimination
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WAEC Prep: Cramer's rule applied to a pair with fractional coefficients
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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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Explain Back: Finding the adjoint of a 2 by 2 matrix quickly
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WAEC Prep: Reading the solution off the product of the inverse and the constants
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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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Worked Example: The units of mass, and the SI unit
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Quiz: Why mass stays the same wherever the body is taken
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WAEC Prep: The difference between a kilogram and a kilogram weight
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WAEC Prep: The newton, and how it is defined
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WAEC Prep: The resultant of two forces acting at the same point
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Spot My Mistake: The greatest and the least resultant of two given forces
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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