If the equation x + 2Y = - 4, 2x-y = 7, y-kx + 9 = 0 has a common solution, then the value of K is

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• 1. Three bivariate linear equations 2x + 5y-6 = 0,3x-2y-9 = 0, y = kx-9 have common solutions if k =? There is a detailed process thank you
• 2. When x = - 0.5, the bivariate linear equation 2x-y = 3 has the same solution as KX + 2Y = - 1? Emergency
• 3. If the equation x + 2Y = - 1,2x-y = 3, kx-y = 9, find the value of K
• 4. If the third power of a is equal to the sixth power of - 8x and the ninth power of Y, what is a =? Come on
• 5. It is known that the two roots of the equation x-7x + 12 = 0 are the two right sides of a right triangle. To find the area of the right triangle (detailed process)
• 6. The two right sides of a right triangle are the roots of the equation x ^ 2-7x + 12 = 0, and the area of a right triangle is calculated~
• 7. Given that the lengths of two sides of a right triangle are two of the equations X & # 178; - 7x + 12 = 0, the area of the triangle can be obtained
• 8. It is known that the lengths of the two sides of a right triangle are the two roots of the quadratic equation x & # 178; - 7x + 12 = 0, and the third length of the right triangle is obtained
• 9. Given that the lengths of two sides of a right triangle are exactly two of the equation x ^ 2-7x + 12 = 0, then the area of the right triangle is?
• 10. The 30 percent of x minus half of the difference is equal to the 20 percent of x plus 6, and the equation is given
• 11. Given that the system of equations (1) 4x + 3Y = 12, (2) X -- 3 / 2Y = 12 and equation y = kx-1 have a common solution, then K=
• 12. Given that the system of equations X / 3, Y / 4 = 2, kx-2y = 3 and equation 2x-y = have a common solution, find the value of K
• 13. If x = - 1y = - 3 is a solution of the equation KX + 2Y = 7, then k = ()
• 14. Given that x = 5Y = 7 is the solution of the equation kx-2y-1 = 0, then K=______ ．
• 15. It is known that x = 5, y = 7 are solutions of the equation kx-2y-1 = O, then K=
• 16. 1. A ^ 2B ^ 2-C ^ 2 + 2Ab + 12. X ^ 2Y ^ 2-4 + XY ^ 2-2y factorization
• 17. Given that m and N are positive integers and M + 3N can be divisible by 11, can m + 3N + 5 be divisible by 11?
• 18. The relationship among similarity, congruence, equivalence and rank of matrix For example, if two matrices are equivalent, we can deduce the rank equality of these two matrices,
• 19. Let the eigenvalues of matrix A of order 3 be the eigenvectors corresponding to 1,2, - 3, A1, A2 and A3 in turn. Let the square matrix B = a * - 2A + 3I, find the eigenvalues of B ^ - 1 and det (b ^ - 1) Please answer for me,
• 20. As shown in the figure, in ladder ABCD, ad is parallel to BC, angle B = 90, AB is perpendicular to BC, ad = 2, BC = 8, and point E is on line CD As shown in the figure, in ladder ABCD, AD / / BC, ∠ B = 90 ° ab ⊥ BC, ad = 2, BC = 8, and point E is on line CD If the trapezoid ABCD is folded along be, point C falls on point P of ray am 1. When point P and point a coincide, find the length of CD 2. Find the length of crease be in 1 3. Let PA = x, be = y, find the functional relationship between Y and X