Substitution Part II (when neither variable is isolated)
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Scroll to the end of this description for the answer to the practice problem! This video explains how to solve a system of linear equations by substitution. In the example shown here, neither variable is isolated.
The four steps that I outline in the video are:
1) Isolate one of the variables in one of the equations
2) Substitute the expression that is equivalent to the isolated variable into the OTHER equation.
3) Solve the equation to find the value of the variable.
4) Use the solution you found in step 3 to find the value of the other variable.
The answer to the practice problem is (5,2).
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Timestamps:
00:00 Intro & Review of Steps from Video 1
00:24 Step 1: Choosing which variable to isolate
02:04 Step 2: Substitute the expression that is equal to the isolated variable
02:55 Step 3: Solving the Equation to find the value of one of the variables
04:16 Step 4: Find the value of the other variable
05:01 Solution and its meaning
05:24 Practice Problem for you!