Matrix equation Ax = b and interpretation of unknown vector x — IITM BS previous year questions

Matrix equation Ax = b and interpretation of unknown vector x is part of Systems of Linear Equations, Week 1 in Mathematics 2. Prasnya files every IIT Madras BS previous year question from this subtopic here, each one with a worked explanation. Take the whole set as a timed mock and you get accuracy, pacing and per-question analysis back.