Dr. Eaton moves further into systems of equations by Solving with Addition and Subtraction. After covering the fundamental principle which allows this technique to work, you will cover four comprehensive examples to make sure you understand the new concepts.
If no coefficient is 1 or 1, use the addition and subtraction method. If you can add or subtract the equations and get one variable to vanish, then just solve for the remaining variable. This called elimination.
Use this method if the coefficients of one of the variables have the same or opposite signs in the two equations.
*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.
Solving by Addition and Subtraction
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.