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

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

How To: Find the Percent Given Two Numbers

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Find the area & perimeter of triangles & squares

How To: Find and sketch the domain of a multivariable function

How To: Convert Fahrenheit to Celsius with a formula

How To: Convert between diameter and radius

How To: Calculate the area of a parallelogram

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

How To: Write a slopeintercept equation given an XY table

How To: Find the equation of a circle given: center & tangent

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

How To: Solve for the missing ratios or proportions

How To: Do long division with decimals

How To: Simplify fourth roots

How To: Simplify radicals which are not perfect squares

How To: Find the equation for a growth pattern
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