GAPSENSE EXERCISE BOOK ANALYSIS REPORT

This appears to be a teacher-written worked example (note the annotation style, arrow annotations, and highlighted tips) rather than independent student work. The handwriting is consistent throughout and the annotations ('you can sub into ① or ② your choice!', 'check your answer by subbing back in') are pedagogical in nature. If this IS student work, the student demonstrates a solid procedural grasp of the elimination method for simultaneous equations: correct identification of matching coefficients, correct subtraction of equations, correct substitution, and correct final answers (b = 2, x = 5). However, there are two significant notation errors: (1) the elimination result is written as '3b = b ÷ 3' instead of '3b = 6 → b = 6 ÷ 3 = 2', and (2) the isolation step is written as '2x = 10 ÷ 2' rather than '2x = 10 → x = 10 ÷ 2 = 5'. These suggest the student understands the process but has not yet internalised how to record multi-step algebraic reasoning in valid notation. The correct final answers indicate the arithmetic is sound. No evidence of gaps in prerequisite arithmetic nodes. NOTE: The prerequisite graph provided does not contain a specific node for simultaneous equations method notation or algebraic communication — B9.2.3.1 is the closest available match.