With this lesson, students find the two-variable linear function that defines the relationship between points for specific x and y values. Using an online function machine applet, students enter x values. The applet returns related y values for the unknown linear function. Students use the information from multiple x and y pairs to determine the unknown linear function. The lesson and applet can help all beginning algebra students understand the relationship between points defined by x and y values and its related linear equation. The predictive power of linear functions when looking at relationships, such as change over time, can be particularly valuable for students in Agricultural and Environmental Systems, Engineering and Science Technologies, Business and Administrative Services, and Finance career fields. (jrs)