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Category | Format | Size |
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Beijing Normal University eighth grade first volume mathematics | pptx | 6 MB |
Description
"Who has more packages" System of linear equations in two variables PPT courseware 2
In a certain Olympic mascot store, the price of a certain mascot highlighter is only 8 yuan each, and a certain mascot plush doll is 40 yuan each.
Xiao Ming bought a total of 10 pieces of the above two items at the counter, spending a total of 240 yuan to collect and give to relatives and friends. May I ask: How many highlighters did Xiao Ming buy in total? How many stuffed animals did you buy?
Suppose Xiao Ming bought x highlighter pens and y stuffed dolls.
What equation can you get from this?
x+y=10
8x+40y=240
An equation containing two unknowns, and the degree of the terms containing the unknowns is 1, is called a linear equation of two variables.
Are any of the following equations linear equations in two variables?
(1) x+y+z = 9, (2) x = 6,
(3) 2x+6y =14, (4) xy+y = 7,
(5) 7x+6y+4 =16, (6) x2+y = 6.
1. Contains only two unknowns;
2. The degree of terms containing unknown numbers is all 1.
According to the above example, in the equations x+y=10 and 8x+40y=240, do the meanings of x have the same meaning? What about y?
The meanings of x and y are the same respectively, so x and y must satisfy the equations x+y=10 and 8x+40y=240 at the same time. Connecting them, we get:
x+y=10,
8x+40y=240.
A set of equations composed of two linear equations containing two unknowns is called a system of linear equations in two variables.
The same letter in each equation of the system of equations must represent the same quantity.
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"Who has more packages" PPT courseware of linear equations in two variables:
"Who has more packages?" PPT courseware on quadratic equations. Suppose the old cow carries x packages and the pony carries y packages. The old cow has 2 more packages than the pony. What kind of equation can you get from this? ? The number of packages for the old cow - the number of packages for the pony = 2 x-y = 2 If the old cow grew up...
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Update Time: 2024-09-08
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