知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业. Y=x的图像是一条直线，在第一第三 象限，如下图所示： y=x属于 一次函数。一次函数是函数中的一种，一般形如y=kx+b（k，b是常数，k≠0），其中x是 自变量，y是因变量。特别地，当b=0.
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