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 graph and solve linear systems using substitution in algebra.
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How To: Remember "greater than" & "less than" symbols

How To: Calculate percent composition for chemistry

How To: Find the Percent Given Two Numbers

How To: Do long division without a calculator

How To: Divide small numbers by big numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Find how many toothpicks will be needed to form the nth figure in a sequence

How To: Use derivatives to find slope in calculus

How To: Subtract a mixed number from a proper fraction in basic math

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

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

How To: Find a number given Its percent

How To: Find the Slope Given 2 Ordered Pairs

How To: Find the standard deviation with the ZScore formula

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

How To: Evaluate square roots

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Express a fraction in lowest terms in basic math

How To: Find the area of a triangle when given 2 sides & angle

How To: Write a sum/difference of logarithms as a logarithm
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