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一次函数y=kx+b(k≠0)的图象是一条直线.斜率k的正负性表示函数的增减性,即当k>0时,函数y随着自变量x的增加而
The image of the first-order function y=kx+b(k≠0) is a straight line. The positive and negative slope of k indicates the increase and decrease of the function, that is, when k>0, the function y increases with the independent variable x.