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Systems of equations with substitution - Khan Academy
It doesn't necessarily matter whether this will be useful in real life, the main point of doing any type of complicated math is to train your brain to use different ways of thinking to come to solutions.
Systems of equations with substitution: -3x-4y=-2 & y=2x-5
Learn to solve the system of equations -3x - 4y = -2 and y = 2x - 5 using substitution. Created by Sal Khan.
𝘶-substitution with definite integrals - Khan Academy
Performing u -substitution with definite integrals is very similar to how it's done with indefinite integrals, but with an added step: accounting for the limits of integration.
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Substitution method review (systems of equations) - Khan Academy
The substitution method is a technique for solving a system of equations. This article reviews the technique with multiple examples and some practice problems for you to try on your own.
Systems of equations with substitution: y=-5x+8 & 10x+2y=-2 …
Learn to solve the system of equations y = -5x + 8 and 10x + 2y = -2 using substitution.
𝘶-substitution (article) - Khan Academy
Key takeaway: Sometimes we need to multiply or divide the entire integral by a constant, so we can achieve the appropriate form for u -substitution without changing the value of the integral.
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Systems of equations with elimination (and manipulation)
In some cases, we need to slightly manipulate a system of equations before we can solve it using the elimination method. See how it's done in this video.