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教材中在小结一次函数y=kx+b时指出,一般地,一次函数y=kx+b的图象是经过点(o,b)且平行于直线y=kx的一条直线,因此,我们把一次函数y=kx+b的图象叫做直线y=kx+b.这里所指的“一般”情况,就是y,x可为任意实数.直线y=kx+b具有两个特性:(1)过点(o,b);(2)与直线y=kx平行,既然是“一般”情况,自然会存在“特殊”情况,由于在实际应用问题中,自变量x与函数y的取值受到一定的限
In the textbook, the first function y=kx+b indicates that, generally speaking, the image of the first-order function y=kx+b is a straight line passing through the point (o,b) and parallel to the straight line y=kx. Therefore, we The image of the first-order function y=kx+b is called the straight line y=kx+b. The “general” case referred to here is y, and x can be any real number. The straight line y=kx+b has two characteristics: 1) over the point (o,b); (2) parallel to the straight line y=kx, since it is a “general” situation, there will naturally be a “special” situation, due to the actual application problem, the independent variable x and The value of function y is limited by a certain limit