When the line y = 3x + 2 moves down one unit, a new function image is obtained. When the value of the new function is less than 0, the value range of the independent variable x is A x is less than - 2 / 3 B x is greater than - 1 / 3 C x ＜ - 1 / 3 D x = - 1 / 3

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• 1. The solution of 3x-3 = y + 5, 5y-5 = 3x + 15
• 2. In the equation 3x-5y = 15, when x = 0, y = ()
• 3. Sometimes the independent variable is X. when the independent variable becomes a formula containing x, how does its definition range change? Please give a specific explanation and the transformation of its image. I'm not sure if I can help you
• 4. It is said in the book that y = f (x), X is an independent variable and Y is a dependent variable. If the function is written as y = 5x + 2, then the independent variable is x and the dependent variable is y. if it is written as x = 1 ^ 5y-2 ^ 5, then y is the independent variable and X is the dependent variable?
• 5. Why is x an independent variable and y a dependent variable in a function Why can't we say that x is a dependent variable and Y is an independent variable
• 6. It is known that y is the inverse proportional function of X, and when x = - 2, y = - 5, the expression of this function and the value range of the independent variable X are obtained
• 7. If the solution of the system of equations {x + y = 8m, X-Y = 2m satisfies 2x-5y = 1, the value of M is obtained
• 8. Given that the solution of the system of equations 2x + 5Y = 7, ax + 4Y = 6 is a solution of the equation x + y = 12, find the value of A
• 9. It is known that the image of function f (x) and the image of function H (x) = 1 / 3x ^ 3 + x ^ 2 + 2 are symmetric with respect to a (0,1) (1) Find the analytic expression of F (x); (2) If G (x) = f (x) + ax, and G (x) is an increasing function on (- ∞, + ∞), find the value range of real number a~ Mathematics is not very good. In fact, the first problem is how to find the symmetry of cubic function,
• 10. If the function f (x) = x ^ 3-3x ^ 2 + 3x + 1, the center of symmetry of the image is
• 11. (6) When the value of independent variable x satisfies what conditions, the value of function y = 3x-5 satisfies the following conditions? (7) using function image to solve X (6) When the value of independent variable x satisfies what conditions, the value of function y = 3x-5 satisfies the following conditions? (1) y =0(2)y =10 (3) y = - 20 (7) use function image to solve x, and check (1) 2x + 3 = 9 (2) 5x-3 = x + 1 (8) the current velocity of an object is 4 m / s, its velocity increases by 3 M / s, in a few seconds, its velocity is 13 m / S? 34 m / S?
• 12. Draw the image of y = 3x-6 when - 1 ≤ X
• 13. Given the function y = √ - 3x-6-7, when the independent variable x takes what value, the function y has the minimum value? And find the minimum value
• 14. If the function y = 3x2 - (9 + a) x + 6 + 2A (x is an independent variable and X is an integer) gets the minimum value when x = 6 or x = 7, then the value range of a is______ ．
• 15. In the following functions, X is an independent variable and Y is a dependent variable. Which are primary functions and which are positive proportional functions? (1) Y = 5 of X (2) y = 5 of X (3) y = - 3x + 1 (4) y = x & sup2; - 1 (5) - 2 of X + 1 Give reasons
• 16. Given a positive proportional function, when the dependent variable y increases by 3, the independent variable x increases by 9, then the relation of this function is
• 17. Is y = 1 / x a positive proportional function (x is an independent variable)
• 18. It is known that y is a positive proportional function of X. when the independent variable x increases by 5, the value of Y decreases by 7
• 19. Let m and n (m ≠ 0) be constants. If in the positive proportional function y = KX, the independent variable x increases m and the corresponding function y increases n, then the value of K is () A. k＝nmB. k＝mnC. k＝−nmD. k＝−mn
• 20. How to determine whether a change relation is a function? Is Y & # 178; = 3x a function?