Given that the sum of solutions X and y of the system of equations 2x-3y = k, x-4y = 6 (k is a constant) is nonnegative, the value range of K is obtained

Subtracting x + y = k - 6 ≥ 0
k ≥ 6

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1. When a is an integer value, the solutions of X + y = a + 4,2x + 3Y = a + 8 are nonnegative?
2. It is known that the solution X of the system of equations X-Y = 3,2x + y = 6a is nonnegative and Y is less than 3
3. If the solution of the equation 2x-7k = 5 (x-k) - 4 about X is nonnegative, find the value of positive integer K
4. When k is a value, the solution of the equation 3-2x-3k = 5 (x-k) + 1 is: positive; negative; zero
5. When k takes what value, the equation X-1 / 5 (3x + k) + 1 / 2 (2x + 7K) = 3-1 / 2 (x-6k) has negative solution?
6. It is known that the solution of the equation 2a-1 / 2x = 7 / 2x + 3 about X is negative
7. If the solution of the equation 3x-m = 5-2x about X is a negative number, then the value range of M is
8. If the solution of the equation 3x-m + 1 = 2x-1 is negative, then the range of M is
9. If the solution of equation a (3x-1) = 2x-5 is negative, find the value range of Adu. Big brother and big sister help me. I need the answer and process before 12:40
10. If the root of the equation MX + 1 = 3x-3 about X is negative, then the value range of M?
11. Decomposition factor X & # 178; - 6xy-5y & # 178;
12. X & # 178; - Y & # 178; - x-5y-6 factorization It's very clear
13. On the Integral Coefficient Quadratic trinomial of X, its quadratic coefficient is 1, the constant term is - 20, and it can decompose factors. Such quadratic trinomial has () A. 2 b.4 C.6 d.8
14. What are the coefficients of quadratic term, primary term and constant term of y = one third (X-5) &# - 4
15. In the quadratic trinomial formula X & # 178; + PX + Q with quadratic coefficient 1, if the constant term Q can be decomposed into the product of two factors AB, and a + B is equal to P in the coefficient of the first term, then it can be decomposed into X & # 178; + PX + q = x & # 178; + (a + b) = (x + a) (x + b) Factorization: x²+9x+14 x²-x-12 x²+8x+12 x²-7x+10 x²-2x-8 x²-9x-22
16. The characteristics of polynomials in the form of x2 + (P + Q) x + PQ are: 1. The coefficient of quadratic term is 1; 2. The constant term is the product of two numbers; 3 The characteristics of polynomials in the form of x2 + (P + Q) x + PQ are: 1. The coefficient of quadratic term is 1; 2. The constant term is the product of two numbers; 3. The coefficient of quadratic term is just the sum of two factors in the constant term, for example, X2 + 3x + 2 = (x + 1) (x + 1). Please decompose the factor according to the method in the above material: A2 + 9a-22
17. Decompose the following polynomials into factor 2 (A-1) &# - 12 (A-1)
18. Decomposition factor: 6x & # 179; Y & # 178; + 12x & # 178; Y & # 179; - 6x & # 178; Y & # 178;
19. Factorization: B ^ 2 + 2bc-a ^ 2
20. Factorization of B ^ 2 + C ^ 2-2bc-a ^ 2