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: Find the Percent Given Two Numbers

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

How To: Find a number given Its percent

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 slope of a line given 2 points with fractions

How To: Translate a shape

How To: Apply the fundamental rule of proportions

Use the quadratic equation: finding the mirror point

How To: Find the equations of parallel and perpendicular lines

How To: Find the area of a parallelogram using geometry

How To: Find the area of irregular shapes

How To: Convert between diameter and radius

How To: Find the volume of a cylinder with given radius

How To: Calculate sales tax in algebra

How To: Draw a rhombus from Geometry

How To: Calculate the area of a parallelogram

How To: Solve for the missing ratios or proportions

How To: Multiply & Divide Numbers (Basic Elementary Math)

How To: Find the Percent Given Two Numbers

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

How To: Find a number given Its percent

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 slope of a line given 2 points with fractions

How To: Translate a shape

How To: Apply the fundamental rule of proportions

Use the quadratic equation: finding the mirror point

How To: Find the equations of parallel and perpendicular lines

How To: Find the area of a parallelogram using geometry

How To: Find the area of irregular shapes

How To: Convert between diameter and radius

How To: Find the volume of a cylinder with given radius

How To: Calculate sales tax in algebra

How To: Draw a rhombus from Geometry

How To: Calculate the area of a parallelogram

How To: Solve for the missing ratios or proportions

How To: Multiply & Divide Numbers (Basic Elementary Math)
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