A complete IB MYP 5 Mathematics Criterion B Investigation on the equation √x = mx + 1 — exploring how the slope of a line determines whether it cuts a square-root curve in two places, touches it once, or misses it entirely.Students move from sketching through to a full algebraic proof — building exactly the kind of structured reasoning Criterion B rewards at Levels 7–8. No calculus required. WHAT'S INSIDE (three print-ready A4 PDFs): Student Paper — 9 pages, 30 marks, 50–60 minutesTeacher Marksc