The main math activity of students in the process of teaching Mathematics at high school is problem solving. This activity helps students consolidate knowledge and develop thinking. However, in order for students to deepen and systemize their knowledge, teachers need to guide students to generalize a specific problem into a general problem and vice versa to know how to concretize a problem from a general problem. In the process of teaching and solving math problems, teachers can help students generalize and concretize through activities to discover common properties, specific properties and relationships between them. The content of this article proposes two teaching processes for solving math problems using the relationship between the particular and the general on the topic Equations of straight lines in space.