Mathematics solves equations for 6th grade, seeking masters.

1.The sum of the two formulas yields: 7x=-35, x=-5, y=-12Move the first equation to the next direction, and get: 7a-8b=4

Subtract the two formulas from one formula to get 2a=6

Get a = 3, b = 17 8

3.Multiply a formula by 3 to get 6x-21y=24

Multiply the two by 2 to get 6x-16y=20

Subtract one from the two formulas to get 5y=-4

Get y=, x=

4.Multiply a formula by 2 to get x-4y=-9

Then subtract one formula from two formulas to get:

y=0, x=-9

4x-5y=-15...Get: 7x=-35

x=-5 substitute x=-5 into :3 (-5) +5y=-205y=-5y=-1

7a-8b=4...

5a-8b=-2...Get: 2a=6

a=3 substitute a=3 :7 3 - 8b=48b=-17

b=17/8

2x-7y=8...

3x-8y=10...

3 - 2, get: -5y=4

y=-4/5

Substitute y=-4 5 :2x - 7 (-4 5)=82x=12 5

x=6/ - 2y=-9/2...

x - y/2=-9...

2 - get: -7y 2=0

y=0 substitute y=0 into : x 2 - 2 0=-9 2x 2=-9 2

x=-9

Well, so many people answered, I won't do it, kid, think more, think more, do a problem, think about why you do it, what is the general step, and then you will do the problem.

90x-53x=740

37x=740

x=740/37=20x=(

x=1003x=3x=

x=Count the rest and be a good boy.

Solution: 2x=10-6

2x=4x=22 Solution: 5x12 = 6

x=403 questions. Solution: 4x 5/5 + 1x 1/2 = 13

13/10x=13

x=10 solution: x: 1/12 = 8: 1/3

1/3x=1/12x8

1/3x=2/3

x=2 solution: 3x=3

3/4x=3/4x=

x = 10 and 2 5

2) Make a list of equations or equations and calculate them.

1 question. Solution: Let this number be x

3/2x=2/5

x=2/5x3/2

x=4/15

2 questions. Solution: Let this number be x

10-2/5x=1/10

2/5x=10-1/10

2 5x = 9 and 9 10

x = 24 and 3 4

Solution: 3/3 x = 2/2

x=This question is incorrect.

Unknown5 6x=18*20%.

The coefficient is one.

x=108/25

15/100x=

x=400/3

25/100x=18

75/100x=25/100x*3=18*3=541/3x-20/100x=6

x=45

Let the unknown number be x, x*5 6=18*

The rest is pretty much the same.

3x-4y=1

The two formulas are directly subtracted to obtain 6y=6, y=1, and the substitution of the formula solution yields x=5 33x+4y=5

Multiply by 3, 3x-18y=-6

3x+4y=5

Subtract 22y=11,y=1 2,x=1

3 {8x+3y+2=0

6x+5y+7=0

Multiply one by 3 and multiply four by two

24x+9y+6=0

24x+20y+28=0

11y=-22, y=-2, x=1 2

4 {2x-y=6

50%x+ reduces the two-formula to 1 2x+1 8y=3 4 times 4, 2x+1 2y=32x-y=6

3 2y=-3, y=-2, x=2

5 {|x |+y=2

x |+2y=3

Subtract y=1, |x |=1, so x=1 or -1

1.Let the first equation be a and the second equation be b

a-b is 6y=6, i.e. y=1

Bring y into any equation, i.e. x=5 3

2.Let the first equation be a and the second equation be b

3a is 3x-18y=-6

b-3a is 22x=11, i.e. x=1, 2

Bring x into any equation and you get y

The second 2, then the first addition and subtraction are calculated to make one, and then substituted for another one.

3m+2n=2 ①

2m-n=-2 ②

Solution: Derive: n=2m+2

Substituting gets: 3m+2(2m+2)=2

Solution: m=-2 7

then n=2 (-2 7)+2=10 7

So, the solution of the original system of equations is:

m=-2/7

n=10/7