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Algebra: Rational Inequalities
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A demonstration of two ways to solve a rational inequality, or an inequality involving a fractional expression.

Author:
Khan, Salman
Algebra: Singular Matrices
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This 15-minute video lesson explains when and why you can't invert a matrix.

Author:
Khan, Salman
Algebra: Slope
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An introduction to calculating the slope of a line.

Author:
Khan, Salman
Algebra: Slope 2
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This continues the discussion of how to determine the slope of a line.

Author:
Khan, Salman