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 solve a system of linear inequalities by elimination.
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How To: Divide small numbers by big numbers

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How To: Find a missing side of a triangle, similar to another

How To: Find the area of a parallelogram using geometry

How To: Find the slope of a line given 2 points with fractions

How To: Remember "greater than" & "less than" symbols

How To: Calculate the area of a parallelogram

How To: Convert between diameter and radius

How To: Solve percentages without a calculator

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How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Convert Fahrenheit to Celsius with a formula

How To: Use the ratio formula to find coordinates of a point
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