![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Given the equation 7x-5y = 3, use the algebraic expression containing x to express y, y =?
7x-5y=3
5y=7x-3
y=(7x-3)/5
The following equations are solved by substitution elimination method. (1) y = x + 3; 7x + 5Y = 9
(1) Substituting (2), 7x + 5x + 15 = 9
12X=-6
X=-0.5（3）
(3) Substituting (1), y = 2.5
Thank you for your reference
From the equations 2x + y = 72y + Z = 82z + x = 9, we can get that the value of X + y + Z is equal to ()
A. 8B. 9C. 10D. 11
It is known that 2x + y = 7, ① 2Y + Z = 8, ② 2Z + x = 9, ③, ① + ② + ③: 3x + 3Y + 3Z = 24, х x + y + Z = 8
RELATED INFORMATIONS
- 1. Given that 2Y + 2Z of x = 2x + 2Z of y = 2x + 2Y of Z = k, find the value of K
- 2. It is known that x = 4, y = 2 is the solution of the system of equations: NX + my = - 2, mx-ny = - 4. Find the direct solution of the square of (M + n) 2008_____
- 3. A and B solve the equations ax + by = 2, mx-7y-8 = 0 A solution to x = 3, y = - 2, B bar m wrong, solution to x = - 2, y = 2, find a. B, M
- 4. A and B solve the system of equations ax + by = 2, mx-7y-8 = 0. A right solution leads to x = 3, y = - 2. B wrongly writes m, and solves x = - 2, y = 2. Find a, B, M
- 5. If 1 / X-1 / y = 2, find the value of (3x-2xy-3y) / (x-2y-y)
- 6. If s = 2x = Y-Z, the range of S is obtained
- 7. If there is only one point between the origin and point (1,1) in the plane region represented by inequality 2x-y + a > 0, then the value range of a is larger
- 8. If the distance between the point P (m, 3) and the line 4x-3y + 1 = 0 is 4, and the point P is in the inequality 2x + y
- 9. Given that the line x + 2y-3 = 0, the intersection circle x ^ 2 + y ^ 2 + x-6y + F = 0 is at the point P, Q, O, and OP is perpendicular to OQ, then f is?
- 10. Known inequality (MX)_ 1) The solution set of (x + 2) > 0 is - 3
- 11. Simplification (x ^ 2-2y ^ 2-z ^ 2) - (- y ^ 2 + 3x ^ 2-z ^ 2) + (5x ^ 2-y ^ 2 + 2Z ^ 2) kuai
- 12. If 7x = 8y, then x: y=______ ：______ ．
- 13. What are the factors of 24? Choose four factors to form a ratio. What is the smallest ratio
- 14. We know that X and y are positive numbers, and prove that: (x + y) (x ^ + y ^) (x ^ 3 + y ^ 3) ≥ 8x ^ 3Y ^ 3
- 15. What is the ratio of x = y, 9, X and Y. y = x + 7, X and y? Why?
- 16. If x / 7 = 9 / y, then what's the ratio between X and y? Why?
- 17. Which of the following functions are linear and which are proportional? (1) y = - 8x; (2) y = 8 / X; (3) y = 5x squared; (4) y = - 0.5x-1
- 18. What is 8x-1 / 2 = 7x + 3 / 7 x
- 19. 8x-2（1-x）=7x-3（x-1）
- 20. Solving equation x ^ 2-16x-4 = 0 by factorization