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"System of linear equations in three variables" System of linear equations in two variables PPT courseware 2
Neither of these two systems of equations is a system of linear equations of two variables. So what is the difference between them and a system of linear equations of two variables? What characteristics do they have in common?
Features: ① Contains three unknowns in total; ② The degree of terms containing unknowns is all 1. ③ Contains three equations in total.
How to solve a system of linear equations in three variables?
The basic idea of solving a system of linear equations in two variables is to try to eliminate an unknown number and convert "two variables" into "one variable".
What is the basic idea of solving a system of linear equations in three variables?
Is it also possible to first eliminate an unknown number and convert "three yuan" into "two yuan", and then convert "two yuan" into "one yuan"? Give it a try!
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(1) The basic methods for solving linear equations of three variables are substitution method and addition and subtraction. Addition and subtraction are more commonly used.
(2) The basic idea of solving a system of three-dimensional linear equations is elimination, and the key is also elimination. We must select the correct elimination object and decide on the elimination plan according to the characteristics of the system of equations.
(3) After solving, it must be substituted into the three equations of the original system of equations for verification.
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For more information about the PPT courseware "System of linear equations in two variables and system of linear equations in three variables", please click on the "System of linear equations in two variables ppt System of linear equations in three variables ppt" tag.
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