If Y-2 and X-2 are in positive proportion, then the functional relationship between Y and X is () A. a linear function may also be a positive proportion function B. a positive proportion function c. a linear function

Because: Y-2 is proportional to X-2, so: Y-2 = K (X-2), that is: y = KX + 2-2k
When k = 1, y is proportional to X
When k is not 1, y and X are linear functions
So: choose a

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1. Among the following functions, the first-order function is (1) y = - 8x (2) y = 5x & # 178; + 6 (3) y = - 8 / X (4) y = - 0.5x-1 (5) y = K & # 178; X + 6 (k is a constant)
2. The following functions: ① y = 2x + 3; ② y = 3 (3-x); ③ y = 3x-x2; ④ y = − X3; ⑤ y = 5 A. ①②③④⑤B. ②④C. ①③⑤D. ②④⑤
3. The following functions are: 1. Y = - 3x + 4 2. Y = 7 / 5x 3. Y = 1 + 2 / x 4. Y = x & # 178; + 25. Y = X-1 / 2, where is a linear function?
4. : when x takes what value, the value of the following function is zero (1) y = - 5 + 3x (2) y = 2x & # 178; - 5x + 3 (3) y = x-3 of X-1 The point is the third question. Because I don't understand. It's better to be clear
5. Find the maximum value of the following function y = 2x & # 178; - 3x-5, y = - X & # 178; - 3x + 7 Find the maximum value of the following functions y＝2x²－3x－5 y=-x²－3x＋7
6. As shown in the figure, it is known that the image with positive scale function y = 3 / 4x and the image with inverse scale function y = K / X intersect at point a, and make a straight line ab ‖ Y axis through point a, and intersect X axis at point B, OB = 4 , m (m, n) is a moving point on the inverse scale function image, where 0 < n < 4 (1) The expression of inverse proportion function (2) When om = OA, find the value of M + n (3) Make a straight line MC ∥ X axis through point m, intersect Y axis with point C, intersect a straight line AB at point D. when the area of quad OADM is 12, please judge the size relationship between cm and DM, and explain the reason
7. The image with known positive scale function y = 1 / 4x passes through point a (2, a) (1) The analytic expression of inverse scale function image passing through point a (2) If any point P in the image of the inverse scale function is taken as the PA ⊥ X axis and Pb ⊥ Y axis, the area of the rectangular OAPB can be calculated
8. When x > 1, the value range of Y is 0
9. The image of a positive scale function passes through (2, - 3), and its relation is a.y = - 3 / 2x b.y = 2 / 3x C.Y = 3 / 2x D.Y = - 2 / 3x
10. When k=__ The function y = 2x ^ (k ^ 2-3x-3) is a positive proportional function
11. If we know that y = KX + K-3 is a positive proportional function, then its analytical expression is
12. It is known that the image of positive scale function y = KX passes through point P (1,2), as shown in the figure. (1) find the analytic expression of the positive scale function; (2) translate the image of the positive scale function to the right four units, and find the analytic expression of the translated straight line
13. It is known that the positive proportional function y = KX (K ≠ 0) and the y of points (2, - 3) on the function increase or decrease with the increase of X
14. The positive proportional function y = KX passes through point a (3, - 4) to find the value of K
15. The image of the linear function y = KX + B (K ≠ 0, B ≠ 0) always passes through the point (0,?) And (0,?) Two points, the positive proportion function y = KX (K ≠ 0) always passes through (0,?) And (1,?) Two points
16. Is the positive scale function y = KX + b k necessarily greater than zero? If K is less than zero, y decreases with the increase of X Is that still a positive ratio?
17. Let y = (K + 2) x + K be the square of - 9=___ It is a positive proportional function passing through two or four quadrants
18. How many quadrants must the image of the positive scale function y = (K & # 178; + 1) x (k is a constant, K ≠ 0) pass through
19. What are the characteristics of symmetry of inverse scale function image The symmetry of the origin of the y-axis is complete It's too esoteric. I just want to know what quadrant is symmetrical and what quadrant is the point after symmetry``
20. Inverse scale function image If the line y = 2x-1 intersects with the Y axis at point a, and then the line is translated upward by one unit, and intersects with the curve y = 2 / X at two points B and C, what is the area of triangle ABC