Key Features of Functions | Part 2: Graphs & the Vertical Line Test (Grade 10 Math)

Part 2 of 4: how to tell if a graph represents a function using the Vertical Line Test, plus two worked examples (pass and fail). 📚 Series: Part 1 (Intro) → Part 2 (this video) → Part 3 (Linear Functions) → Part 4 (Rate of Change) → Part 5 (Real-World Review) ✅ Answers to this video's practice problems: 1. y = 2x + 1 is a straight line — every vertical line crosses it exactly once, so it passes the test and is a function. 2. y² = x + 3 is NOT a function of x — at x = 1, both y = 2 and y = -2 work, so one input gives two outputs. Subscribe for Parts 3–5! #GradeMath #Functions #Algebra2 #MathWithMrMohamed