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 a slope of a straight line with: Ax + By + C = 0

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

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

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

How To: Find the Slope Given 2 Ordered Pairs

How To: Convert temperature using y = mx + b

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Divide small numbers by big numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the area of an oblique triangle using formulas

How To: Prove Rank(A) = Rank(transpose of A) in linear algebra

How To: Solve word problems containing radical equations

How To: Draw a rhombus from Geometry

How To: Know if matrices can be multiplied

How To: Factor a trinomial with negative leading coefficient

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

How To: Calculate the area of irregular shapes

How To: Find a slope of a straight line with: Ax + By + C = 0

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

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

How To: Calculate Faster Than a Calculator

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

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

How To: Find the Slope Given 2 Ordered Pairs

How To: Convert temperature using y = mx + b

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Divide small numbers by big numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the area of an oblique triangle using formulas

How To: Prove Rank(A) = Rank(transpose of A) in linear algebra

How To: Solve word problems containing radical equations

How To: Draw a rhombus from Geometry

How To: Know if matrices can be multiplied

How To: Factor a trinomial with negative leading coefficient

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

How To: Calculate the area of irregular shapes
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