IB Maths AI SL 2.1 - Lines Notes

IB Maths AI SL 2.1 – Lines Notes

Support your IB Mathematics: Applications and Interpretation SL lesson on straight lines with these clear, structured notes. Students connect graphical and algebraic representations while building confidence with gradients, intercepts, and equations of lines.

Topics covered

• Reading and interpreting straight-line graphs, including x- and y-intercepts.
• Calculating gradient using rise over run and interpreting slope.
• Writing line equations in gradient-intercept, general, and point-gradient form.
• Finding a line equation from two points and using intercepts as coordinates.
• Identifying parallel and perpendicular lines, including using the opposite reciprocal gradient.

Worked examples model each skill, and a short exit ticket gives students an opportunity to check their understanding independently. These notes are suitable for guided classroom instruction, independent review, or revision for IB Math AI SL Topic 2.1.

Use alongside the IB Math AI SL 2.1 – Lines slide deck and IB Math AI Worksheet 2.1 – Lines for a complete lesson and practice set.