Need to know how to solve a system of algebraic equations? From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to work with and solve systems of linear equations in intermediate algebra.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find a number given Its percent

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How To: Evaluate factorials with a TI83 calculator

How To: Add large numbers with an acabus calculator

How To: Find the area of a parallelogram using geometry

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How To: Divide small numbers by big numbers

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How To: Know if matrices can be multiplied

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