IB Math AA SL 2.1 - Lines

This IB Math AA SL 2.1 – Lines resource builds a clear understanding of straight-line graphs by linking equations, gradients, and intercepts to their graphical meaning. Students learn how to find the gradient from two points, interpret slope as rate of change, and work confidently with multiple forms of linear equations, including gradient-intercept, general, and point-gradient forms .
The lesson also develops relationships between lines, showing how equal slopes indicate parallel lines and opposite reciprocal slopes indicate perpendicular lines. With structured examples and exam-style practice, students learn to form equations, find intercepts, and apply slope concepts accurately, supporting strong SL-level foundations in linear functions and coordinate geometry .