Positive proportion function in mathematics of grade two

In general, the relationship between two variables X and y can be expressed as a function of y = KX (k is a constant, the degree of X is 1, and K ≠ 0), then y is called the positive proportion function of X. The positive proportion function belongs to the first-order function, but the first-order function is not necessarily a positive proportion function. The positive proportion function is a special form of the first-order function, that is, in the first-order function y = KX + B, if B = 0, When k > 0 (one or three quadrants), the larger the absolute value of K, the closer the distance between the image and Y axis. The value of function y increases with the increase of independent variable x. when K0, the image is in the first and third quadrants, rising from left to right, Y increases with the increase of X (monotonically) and is an increasing function

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