一、函数图象与其系数的关系函数图象 (或性质 )与其系数之间有着密切的关系 :1 正比例函数ｙ =ｋｘ(ｋ≠ 0 ) :( 1 )ｋ 0 图象在一、三象限内 ,且ｙ随ｘ的增大而增大 ;( 2 )ｋ 0 图象在二、四象限内 ,且ｙ随ｘ的增大而减小 ;2 反比例函数ｙ =ｋｘ(ｋ≠ 0 ) :( 1 )ｋ0 First, the function of the relationship between the image and the coefficient image (or property) has a close relationship between its coefficients: 1 positive proportion function y = kx (k ≠ 0): (1) k 0 image in one or three quadrants y increases with x; (2) the k0 image is in the second and fourth quadrants, and y decreases as x increases; 2 inverse proportional function y = kx(k≠ 0) :( 1)k0