Help solve the 2 element equation 25

y=2x 2x+y=16

then 2x+2x=16

x=4,y=8

x+y=13

x-y=7 is added together, and 2x=20

x=10, then y=3

4x+3y=5

x-2y=4

Multiply the second formula by four to get 4x-8y=16

Subtract from the original equation and -11y=11

y=-1, then x=2

3(x-1)=y

5(y-1)=3(x+5)

5【3(x-1）-1】=3(x+5)

x=35/12 y=23/4

x=3y 2x-y=5

6y-y=5

y=1, x=3

3x-2y=2

3x+y=8

Subtract the two formulas, 3y=6

y=2 x=2

Addition, subtraction, and subtraction.

Compose the first equation with the second equation a term that has the same term, e.g. 2x+3y=10, 2x-z=2

Thus, the term of x is eliminated, and the subtraction method is used to obtain 4y=8, y=2, and the most important method is to eliminate the element, removing an unknown term.

Substitution of the elimination method.

For example: x=2y+1, 3x+y=10, substitute x=2y+1 into 3x+y=10, get 3(2y+1)+y=10, and then calculate it yourself.

For equations of class 2x=y+1, change it and divide it by 2 on both sides, and then substitute it.

There are countless solutions to determining one value and then finding another.

7x-y=2...

x+5y=-1...

Solution: +7, got.

y+35y=2-7

34y=-5

y=-5/34

Substitution, got.

x=9/34

20x+20y=400

200x-200y=400

Solution: Simplification of the original equations.

x+y=20...

x-y=2...Get. 2x=22

x=11-, got.

2y=18y=9

7/100x+8/100y=13/100*2006-y):(4+x)=72

5x+2y=41...

2x-5y=-1...

Solution: 2- 5, got.

4y+25y=82+5

29y=87

y=3 substitute y=3 into , get.

x=7 to help solve the binary equation.

x+y=1600 ①

x/(x+y)=

From (x+y) x=1+(y x)=1 we get y x=20 9 -1=11 9

This gives y=11x 9

Bring in. x+ (11x/9)=1600

20x/9=1600

x=1600×9/20=720

then y=1600-720=880

So, the solution of the system of equations is x=720, y=880

10x+6y=51 （1

8x+12y=51+18 （2

Multiply 1 by 2 to get 20x+12y=102 (33 subtract (2, get 12x=33 12.)

Brought in, we get y=47 12

Multiply the left and right sides of Equation 1 by 2 at the same time, and 20x+12y=102--- is set as Equation 3.

Subtract Equation 2 from Equation 3 to get 12x=51-18=33, so we can find, x=33 12=11 4

Then bring x=11 4 into Equation 1, 10*(11 4)+6y=51, so y=47 12

2100x+700y= Eq. 1

900x+2700y= 2 hail of the bucket

Use addition and subtraction: formula 1*3 - formula 2*7 can be obtained: no sail.

2100y-18900y=

16800y=

y=x=