"Solving a system of linear equations in two variables" A system of linear equations in two variables PPT courseware 4

Description

"Solving a system of linear equations in two variables" A system of linear equations in two variables PPT courseware 4

think

What are the characteristics of the previous systems of equations? What is the basic idea of ​​​​solving such systems of equations? What are the main steps?

Features: The absolute value of the coefficient of a certain unknown number is the same

Basic idea: addition, subtraction and elimination of elements

Main steps: two-element - one-element

Solve the following system of linear equations in two variables

2x+3y=12

3x+4y=17

Solution: ①×3, get: 6x+9y=36.③

②×2, get: 6x+8y=34. ④

③-④, get: y=2.

Substituting y=2 into ①, we get: x=3.

So the solution to the original system of equations is x=3 y=2

(1) The basic idea of ​​adding, subtracting and eliminating elements to solve a system of linear equations of two variables is still "elimination".

(2) The general steps for solving a system of linear equations in two variables by adding, subtracting and eliminating elements are:

①Deform to make the absolute value of the coefficient of an unknown number equal.

②Add and subtract elements to obtain a linear equation of one element.

③Solve linear equations of one variable.

④ Substitute the value of another unknown number to obtain the solution of the system of equations.

Keywords: courseware for systems of linear equations in two variables, courseware for solving systems of linear equations in two variables, Beijing Normal University edition mathematics PPT courseware for the first volume of eighth grade, download courseware for eighth grade mathematics slides, download PPT courseware for systems of linear equations in two variables, solving linear equations in two variables System of equations PPT courseware download, .ppt format

For more information about the PPT courseware "Solving a system of linear equations in two variables from a system of linear equations in two variables", please click the "Solving a system of linear equations in two variables ppt" tag.

"Solving Systems of Linear Equations in Two Variables" System of Linear Equations in Two Variables PPT Courseware 3:

"Solving a system of linear equations in two variables" System of linear equations in two variables PPT courseware 3 Review and thinking Do you still remember the following question? Yesterday, 8 of us went to Hongshan Park to buy tickets and spent 34 yuan. Each adult ticket was 5 yuan each. A child ticket costs 3 yuan. How many adults and how many...

"Solving a system of linear equations in two variables" System of linear equations in two variables PPT courseware 2:

"Solving a system of linear equations in two variables" PPT courseware for a system of linear equations in two variables 2 Learning objectives 1. Understand the basic idea of ​​the addition, subtraction and elimination method, and initially embody the reduction idea of ​​turning the unknown into the known in mathematical research. 2. Clarify the solution 2 Steps to solve a system of linear equations in two variables. 3. Understand and solve linear equations in two variables..

"Solving Systems of Linear Equations in Two Variables" PPT courseware for systems of linear equations in two variables:

"Solving a system of linear equations in two variables" A system of linear equations in two variables PPT courseware Learning objectives 1. Master the steps of using the substitution method to solve a system of linear equations in two variables. 2. Be proficient in using the substitution method to solve simple systems of linear equations of two variables. 3. Cultivate students' analytical skills and be able to quickly analyze the information given..

File Info

Update Time: 2024-11-22

This template belongs to Mathematics courseware Beijing Normal University eighth grade first volume mathematics industry PPT template

Preview