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Solve systems of linear equations with substitution
By Khan Academy
Sal solves the following system of linear equations using substitution: -3x-4y=-2 and y=2x-5.
Solve any system of two linear equations
By Khan Academy
Sal solves several examples where he reasons about the number of solutions of systems of equations using algebraic reasoning.
Shift functions
By Khan Academy
Sal walks through several examples of how to write g(x) implicitly in terms of f(x) when g(x) is a shift or a reflection of f(x).
Symmetry and periodicity of trigonometric functions
By Khan Academy
Sal finds several trigonometric identities for sine and cosine by considering horizontal and vertical symmetries of the unit circle.
Volume with unit cubes 1
By Khan Academy
Volume is usually measured in cubic feet (or inches, or centimeters, etc). Let's practice counting cubic feet in order to find the volume.
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.
Understanding moving the decimal
By Khan Academy
When we were multiplying, we moved the decimal to the right for each power of ten. Guess what? When dividing, we move the decimal to the left for each power of ten.
