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Solve systems of linear equations with elimination (basic)
By Khan Academy
Sal solves the following system of equations by eliminating x: x-4y=-18 and -x+3y=11.
Solve any system of two linear equations
By Khan Academy
Sal determines how many solutions the following system of equations has by considering its graph: 10x-2y=4 and 10x-2y=16.
Solve any system of two linear equations
By Khan Academy
Sal determines how many solutions the following system of equations has by considering its graph: 10x-2y=4 and 10x-2y=16.
Symmetry and periodicity of trigonometric functions
By Khan Academy
Sal finds several trigonometric identities for tangent by considering horizontal and vertical symmetries of the unit circle.
Comparing volumes with unit cubes
By Khan Academy
Sometimes, we can't just count the number of cubes to find the volume because there are too many. In those situations, you need another way of measuring volume. This video gives you the solution.
Volume word problems
By Khan Academy
Perhaps you've noticed that after teaching you the concept and doing a few example problems together, we always like to throw you a word problem in which you have to apply what you've learned. So here let's find the volume!
Using visuals to add and subtract fractions with unlike denominators
By Khan Academy
Learn to subtract 3/4 - 5/8 using a fraction model for help.
