The purpose of this study is to find out the differences between a teacher and students on mathematical noticing of linear function graphs in case of translations, intercepts and slopes and to suggest methods of teaching linear function graphs. To serve this purpose, a framework was developed for analysis on mathematical noticing of linear functions graphs, using a conceptual framework of Value-Thinking and Location-Thinking (David et al., 2019) and mathematical noticing (Kim,2019). The results showed a teacher and students paid attention to the value or location of the point on the graphs of the linear functions. Although a teacher and students paid attention to the same point on the graphs of the linear functions, they differently interpreted and responded. This result indicated that the aspects of thinking to help students’ mathematics learning were different in the domains of translation, intercept, and slope of the graphs of the linear functions. The researchers suggest mathematical noticing on Value-Thinking in translations, Location-Thinking in intercepts, and Location-Thinking and then Value-Thinking in slopes, would help students better understand.