Does either of the equations have an isolated variable in it?
Method: Substitution Solution: x=3, y=- 8
Practice makes perfect
In this system of equations, at least one of the variables has a coefficient of 1. Therefore, we will approach its solution with the Substitution Method. When solving a system of equations using this method, there are three steps.
Isolate a variable in one of the equations.
Substitute the expression for that variable into the other equation and solve.
Substitute this solution into one of the equations and solve for the value of the other variable. For this exercise, y is already isolated in both equations, so we can skip straight to solving! Let's use the expression equal to y in (II) for our initial substitution.
