How to judge inverse proportion function

If the product of each set of corresponding values of two variables is a constant which is not equal to 0, then the two variables are said to be in inverse proportion. A function such as y = K / X (k is a constant, K ≠ 0, X ≠ 0) is called an inverse proportion function
The deformation formula is xy = k or y = KX ^ - 1 or y = K1 / X

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1. The definition of positive proportion function
2. Deformation of positive proportion function Is the positive proportion function y = KX (k is not equal to 0), and after deformation, k = Y / X (k is constant and not equal to 0) a positive proportion function? If so, its definition and range have changed
3. Positive proportion function in mathematics of grade two
4. A quadratic function judgment problem! If b > A + C, then ax & sup2; + BX + C = 0 has two unequal real roots How can this sentence be proved right or wrong? Online kneeling for the emperor of mathematics! It is better to give the process of proof
5. The judgment of quadratic function in the third grade of junior high school If you look at the image of y = x, which of the following judgments is correct A. If a and B are opposite to each other, then the function values of x = A and x = B are equal B. For the same independent variable x, there are two function values corresponding to it C. For any real number y, there are two X's corresponding to it D. For any x, there is Y > 0
6. A junior high school quadratic function judgment! The quadratic function y = - AX2 (2 is exponential) is known. When x < 0, the symmetry axis of y = - AX2 (2 is exponential) is Y axis Is this question right or wrong? Why?
7. Critical questions! Urgent The volume of a cylinder is two thirds larger than that of a cone The larger the volume of a cone, the larger its base area The sector chart reflects the relationship between the part and the total The unit price of the subscription is inversely proportional to the number of copies When the ratio of a to B is 5:4, the number of a is 25% more than that of B
8. The questions are as follows: Dalian ushered in the dawn before Xi'an 2. When the sun is directly on the equator, it is winter in the northern hemisphere All meridians are of equal length, and the equator is the longest of the latitudes The direction of the earth's revolution is just opposite to that of its rotation The center of the earth's rotation and revolution is the earth's axis
9. The image of positive scale function passes through (- 2, - 3), and the analytic expression of this function is
10. Given that the image of a positive scale function passes through the point m (- 1,5), find the analytic expression of this function?
11. Several areas of inverse proportion function
12. Inverse scale function
13. The distance is not proportional to the time!
14. Why is it wrong and right (1) The distance is proportional to the time (2) The edge length of a cube is proportional to its volume (3) 40% of a and B. A and B are in direct proportion (4) The base of a parallelogram is 8 cm. Its area is proportional to its height Are the above four judgment questions right or wrong` Why is it wrong and why is it right`` (3) A is 40 percent of B. A and B are in direct proportion. （） I wrote the third question wrong last time
15. Positive and negative proportion judgment questions When the product of two variables is constant, they are inversely proportional () 2. In the formula 7x-y = 0, X is proportional to y () 3. Planting a lawn, the area that has been planted is inversely proportional to the area that has not been planted () 4. The two related quantities are in direct proportion but also in inverse proportion 5. When XY is reciprocal to each other, X is inversely proportional to y () 6. When the difference is constant, the subtracted is in direct proportion to the subtracted ()
16. Positive proportion judgment Divide the number a by the number B, and the result is three. The number a and the number B must be in positive proportion. Is that right?
17. A problem of positive proportion function in grade two of junior high school It is known that y + m is proportional to x-n, and when x = 2, y = 3; when x = 1, y = - 5. Find the value of y when x = - 1
18. Positive proportion function in grade two of junior high school (just learned today) If the function y = (k-1) x 3K + 5 is a positive proportional function, the value of K is obtained Note: (k-1) x (not a multiplication sign) the degree of X is 3K + 5
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20. Second grade positive proportion function online, etc If Y-2 is positively proportional to x + 2 and x = 0, y = 6. Write the functional relationship between Y and X Is it y = 2x + 6?