IB skill practice

Interpret inverse transformation matrices

Use an inverse matrix to recover an original coordinate.

Paper 1, Paper 2 5 marks Difficulty 3

Interpret inverse transformation matrices - depth scenario

Check the modelling or algorithm condition first. A stretch matrix sends an original x-coordinate to 16 using scale factor 4. Use the inverse transformation to find the original x-coordinate. Enter the requested value and choose the interpretation that matches the result.

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.