2x-5 + Y / 3 = x + 3Y / 4 + 7 and 10 (X-Y) - 4 (1-x) / 3-y = 0

2x-5 + Y / 3 = x + 3Y / 4 + 7 and 10 (X-Y) - 4 (1-x) / 3-y = 0

The equation (y = 2x-1 / 2) can be obtained by substituting (y = 0-2x-1) / 2 (y = 0-3 x-1) / 2 (y = 0-3 x-1) / 2 (y = 2 X-1 / 2)

To solve the equations: (1) {X / 2 = Y / 3; 30% × x-16% × y = 2%} (2) {2x + 3Y / 4 + 2x-3y / 3 = 7; 2x + 3Y / 3 + 2x-3y / 2 = 8 Answer before 19:30 pm on May 2!

(1) X / 2 = Y / 3 ① 30% x-16% y = 2%. ② from ①, 3x-2y = 0; ③ from ②, 15x-8y = 1; ④ ④ - ③ × 5; 2Y = 1 solution, y = 1 / 2. Substituting y = 1 into ①, X / 2 = 1 / 6 solution, x = 1 / 3 ﹤ x = 1 / 3, y = 1 / 2 (2) 2x + 3Y / 4 + 2x-3y / 3 = 7 ① 2x + 3Y / 3 + 2x-3y / 2

In the solution of the equations 4x-3y = 7, (K + 1 / 2x) - y = K-3 for X, y, (1) If x and y are opposite numbers to each other, find the value of K; (2) If x and y are equal, find the value of K

Sorry! The second equation in the original question is typed incorrectly and cannot be solved directly
Methods: (1) put x = - y into the equation 4x-3y = 7, get y = - 1, x = 1, and substitute it into the second term to find K
(2) Put x = y into the equation 4x-3y = 7, and get x = y = 7, then put it into the second term to find K
If you have any questions, please ask; if you are satisfied, please accept it. Thank you!

Given that the average of 2,7, x, y is 1.5.7, - 3Y 7, - 2x, X-Y, and the average of four numbers is 2, what is X-Y?

(2+7+x+y)/4=1.5
x+y=-6 (1)
(7-3y+7-2x+x-y)/4=2
-x-4y=-6
x+4y=6 (2)
(1)×5-(2)×2
5x+5y-2x-8y=-30-12
3x-3y=-42
x-y=-14

It is known that the average number of a group of numbers 1,2,3,4, a, 6 is B, and a, B is the system of equations 2x + y = 7, x + 2Y = 8 The number, the average, needs a complete procedure

A, B is the solution of the equation system, 2x + y = 7, x + 2Y = 8, that is, from 2x + y = 7, x + 2Y = 8, that is, x = 2, y = 3, that is, a = 2, B = 3 or a = 3, B = 2, when a = 3, B = 2, when a = 3, B = 2, when a = 3, B = 2, the average of the average number of 1,2,3,4, a, 6, 6, is B, that is, 1,2,3,4,4,3,3,6, the average number of the average is 2, this conclusion is wrong, the conclusion is wrong, the average number of 1,2,3,4,3,3,3,6, 6, the average number of 19 / 6, when a = 2, B = 3, and

It is known that the mean of X, y, 5, 6, 8 is 7. (1) find the average of X and Y. (20 find the average of 2x + 5,3y-3, x + y, 10) Come on, come on,

(x+y+5+6+8)/5=7,x+y=16
(x + y) / 2 = 8, so the average is 8

It is known that the average of the four numbers 2,7, x, 3Y is 4.5; 7, Y-3, 7-2x, x-2y is two, so what is X-Y equal to?

(2+7+x+3y)/4=4.5
（7+y-3+7-2x+x-2y）/4=2
By simplifying the above two equations, we get
x+3y=9
x+y=3
By solving the equation
X=0
Y=3
Then X-Y = - 3

Given that the mean of X Y 56.8 is 7, find the average of 2x + 53y-3x + Y10

The average of X Y 56.8 is 7, which indicates that x + y = 16 (5 * 7-5-6-8)
"2x + 53y-3x + y in general, such questions can be directly used with x + y = 16, which is usually referred to as" overall substitution ", but you are not clear about this question, what is the average of several numbers?

Solving the system of three variable first order equations: X / 7 = Y / 10 = Z / 5,2x + 3Y = 44

Let X / 7 = Y / 10 = Z / 5 = K
x=7k
y=10k
z=5k
Substitution
2x+3y=44=14k+30k
The solution
K=1
therefore
X=7
y=10
Z=5

Solve the equations 3x + 2Y + Z = 14, y + Z + x = 10, Z + 2x + 3Y = 15

3x+2y+z=14 1
y+z+x=10 2
z+2x+3y=15 3
1-2 gives 2x + y = 4.4
3-2 gives x + 2Y = 5.5
4 * 2-5
3*x=3 x=1
In 4, y = 2
Take x, y into 2, z = 7