Students identify independent and dependent variables and represent linear relations using tables, graphs, and equations in two variables, including slope-intercept form $y=mx+b$. They determine and interpret constant rates of change from tables, graphs, equations, and contexts, including positive, negative, zero, and fractional slopes with appropriate units, and determine $y$-intercepts from graphs and equations. Students write equations from tables and graphs, graph slope-intercept equations, and compare multiple linear relations by analyzing rates of change, initial values, outputs for shared inputs, and points of intersection.