Solving Systems by Substitution
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Scroll to the end of this description for the answer to the practice problem!
This video will show you how to solve a system of equations by substitution when one of the variables is already isolated (video part II shows you how to solve when 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 in the video is (3,-4)
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Timestamps:
00:00 Introduction & Steps
01:15 Which variable to isolate?
02:11 Step 2: How to substitute the expression equal to the isolated variable into the other equation
04:50 Step 3: Solve the equation to find the value of one of the variables
07:10 Step 4: Solve for the value of the other variable
08:53 Final Solution & Graphing Connection
10:01 How to check your solution
12:02 Practice Problem for you!