Solve the equation 2x + 5Y = 12,2x + 3Y = 6

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• 1. 2x-5y = 7.2x + 3Y = - 1
• 2. 2x+5y=7 2x-3y=-1
• 3. 6x+5Y=31 2X+3Y=17 Find x Find y
• 4. It is known that x ≥ 0, y ≥ 0, 3x + 4Y = 12; the maximum and minimum of ∣ 2x-3y ∣ are obtained
• 5. If the coefficient in front of X and Y in the general equation of circle is not 1, what kind of equation is it? For example: 6x ^ 2 + 4Y ^ 2-6x = 0 There is also a linear term x in the formula, which should not be an ellipse
• 6. Find the linear equation parallel to the line x + y + 3 = 0 and tangent to the square of circle x + y-6x-4y + 5 = 0
• 7. The equation of circle x ^ 2 + y ^ 2-6x-4y + 10 = 0
• 8. If the line L bisects the circle x ^ 2 + y ^ - 2x-4y = 0 and it is no more than the fourth phenomenon, then the slope of the line L is in the range of
• 9. Given the circle C: X & # 178; + Y & # 178; - 2x + 4y-4 = 0, ask whether there is a straight line L with a slope of 1, so that l is cut by the circle C If there is a circle with the diameter of string AB passing through the origin, write the equation of line L; if there is no such a circle, explain the reason
• 10. Given curve C: x ^ 2 + y ^ 2-2y-4y + M = 0 (1), when m is what value, curve C represents circle?
• 11. Solution equation: (6x + 5Y) - (2x-3y) = 336
• 12. -6x(2/3x-2/5y)+12y(-3/8x+1/3y)=?
• 13. The solution equation is as follows: {2x / 3 + 3Y / 4, 4x / 5 + 5Y / 6 = 7 / 15
• 14. Given {x + 4y-3z = 0,4x-5y + 2Z = 0, then 3y-5z of 2x-y + 3Z =?
• 15. If x + 4y-3z = 0; 4x-5y + 2Z = 0, then 2x-y + 3Z =?
• 16. If x and Y in fraction XX + y are expanded to three times of the original, then the value of fraction XX + y is smaller______ ．
• 17. If xy = - 3, x + y = - 1 / 4, then the value of X + (xy-4x) - 3Y is?
• 18. If xy = - 3, x + y = - 1 / 3, then the value of X + (xy-4x) - 3Y is (),
• 19. Given x + y = 3, xy = - 10, find (1) x ^ 2-xy = y ^ 2; (2) X-Y
• 20. Given x + y = 3, xy = - 10, then | X-Y|=