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.

Notice that neither of these equations are already solved for x or y . As a result, the first step is to solve for x or y first. Here's how it goes:

When solving a system of equations using substitution, you can isolate one variable and substitute it with an expression from another equation. This will allow you to solve for one variable, which you can …

Solve systems of equations where one of the equations is solved for one of the variables.

Learn to solve the system of equations -3x - 4y = -2 and y = 2x - 5 using substitution. Created by Sal Khan.

We can solve for n and q. And let's do it by substitution. So the easiest thing that we could do here, let's solve for q over here. So if n plus q is equal to 16, we could subtract n from both sides of this …

In these series of videos (U-substitution) you introduce the treatment of the derivative operators (dx, du, etc) as fractions. You specify that they really are not, but treat them like that anyway.

In the u-substitution exercises for definite integrals, the next exercise asks us to integrate functions like 1/ (1+x²) and check our answer using the derivative of arctan (x), even though we haven’t learned …

To solve a system of equations using substitution... 1. Isolate one of the variables in one of the equations, e.g. rewrite 2x+y=3 as y=3-2x. 2. You can now express the isolated variable using the …

If one line is useful, let's see what we can do with two lines. In this unit, we learn how to write systems of equations, solve those systems, and interpret what those solutions mean in a real-world context.