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Proof that rational times irrational is irrational | Algebra I | Khan Academy
By Khan Academy
Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
Comparing linear functions word problems
By Khan Academy
Sal is given a table of values that represents a person walking to work, and is asked to determine which verbal description represents someone starting at the same distance from work.
Comparing linear functions word problems
By Khan Academy
Sal is given a table of values that represents four people walking to school, and is asked to determine which one started out farther from the school.
Comparing linear functions word problems
By Khan Academy
Sal is given the formula and a table of values that represent two people climbing a wall, and is asked to determine which one started out higher.
Comparing linear functions
By Khan Academy
Sal is given a table of values of a linear function and four linear graphs, and is asked to determine which graph increases faster than the function represented in the table.
Constructing linear functions word problems
By Khan Academy
Sal is given a verbal description of a real-world relationship involving a person painting his room, and is asked to find the formula of the function that represents this relationship.
Comparing linear functions
By Khan Academy
Sal is given the formula of a linear function and the graph of another, and is asked to determine which function increases faster.
Comparing linear functions
By Khan Academy
Sal is given a table of values of a linear function and four linear graphs, and is asked to determine which graph has the same rate of change as the function represented in the table.
Graphing solutions to two-variable linear equations
By Khan Academy
Graphing solutions to 2 variable linear equations
Graphing solutions to two-variable linear equations
By Khan Academy
Graphing solutions to 2 variable linear equations
Comparing linear functions word problems
By Khan Academy
Sal is given the formula and a table of values that represent two people climbing a wall, and is asked to determine which one started out higher.
Graphing linear functions word problems
By Khan Academy
Sal is given a verbal description of a real-world relationship involving a pool being filled with water, and is asked to draw the graph that represents this relationship.
Constructing linear functions word problems
By Khan Academy
Sal is given a verbal description of a real-world relationship involving a person painting his room, and is asked to find the formula of the function that represents this relationship.
Graphing linear functions word problems
By Khan Academy
Sal is given a verbal description of a real-world relationship involving a pool being filled with water, and is asked to draw the graph that represents this relationship.
Graphing linear functions word problems
By Khan Academy
Sal is given a verbal description of a real-world relationship involving a pool being filled with water, and is asked to draw the graph that represents this relationship.
Graphing linear functions word problems
By Khan Academy
Sal is given a verbal description of a real-world relationship involving a truck's fuel consumption, and is asked to draw the graph that represents this relationship.
Constructing linear functions word problems
By Khan Academy
Sal is given a verbal description of a real-world relationship involving a person painting his room, and is asked to find the formula of the function that represents this relationship.