If the solution of the equations X-Y = m, x + y = 3m-8 satisfies x + 2Y = 4, then M =?

m=4
x-y=m ①
x+y=3m-8 ②
①+②
2x=4m-8
①-②
2y=2m-8
x+2y=4
2m-4+2（m-4）=4
m=4

RELATED INFORMATIONS

1. Solving equations solving equations: x + | 2x + y | = 10, x-2y = 8 To solve the equations: x + | 2x + y | = 10 x-2y=8
2. For any rational number a, B defines the operation "." as follows: A.B = a + b-1003.5, calculation: 1.2.3.4.5.6.2006.2007
3. a. B is a rational number, and √ (7-times root sign 3) (note brackets,) is a root of the equation x ^ + ax + B = 0, find a + B If I can't do it, I'll be scolded to death I'll thank you
4. The equation x ^ 2-2mx + 2m ^ 2-1 = 0 of X has at least one negative real root, and the range of M is obtained
5. (2x-1)/5+(3y-2)/4=2 (3x+1)/3-(3y+2)/4=3/4
6. Please use the root formula of cubic equation of one variable to solve the following equation: 2x ^ 3-x ^ 2-3x = 0
7. How many roots does a cubic equation have?
8. By factoring the equation: - 3x ^ + 6x-2 = 0, the value of X can be obtained
9. 15/3x=15/x-2/3 And 72 / 20 + x = 48 / 20-x And 1 / 2x = 1 / 4
10. (1) - 2x ^ 2 - [(13X) - 4 (3x ^ 2-4x) + 3x ^ 2], where x = - 4 (2) 2 (- A ^ 2B + 3AB ^ 2) - 4 (AB ^ 2 + 3A ^ 2b) - 2 (AB ^ 2-2a ^ 2b) where a = - 2, B = 1 / 4
11. Given that y = - 1 is the solution of the equation 2-1 / 3 (M-Y) = 2Y, then the solution of the equation x + 4 = m (2x + 4) about X is
12. What is the product of all roots of equation x ^ 2-3x-6 = 0 and equation x ^ 2-6x-3 = 0?
13. Try to determine the number of real roots of the equation x ^ 3 - 3x + 1 = 0 in the interval (0,1) To solve the problem in detail, thank you very much
14. Solve the equation about X: ax-6 = 3x and find the positive integer solution of the equation when a is an integer
15. 3(1-x)
16. -If 2xmy6 and 35x3y2n are of the same kind, then M + n=______ ．
17. Is there any difference between the degree of constant term in polynomial and monomial For example, in the 1-monomial, the degree is 0. What about in the polynomial
18. Is 0 a monomial? Is fraction a constant? Is 0 a monomial? Is 0 a fraction? Is 0 a constant? How much is 3 times x to the second power multiplied by Y minus 5x times y to the second power?
19. Given that (A-1) x ^ 2Y ^ A + 1 is the quintic monomial of X and y, (1) a ^ 2 + 2A + 1 (2) (a + 1) ^ 2, what do you think
20. If both 2xay4 and 12b2x2ya-b are binomial with respect to X and y, and the coefficients are equal, try to find the values of a and B