What is the equation of the line passing through points (2, 5) and (6, 13)?
Answer and explanation
Correct answer: A. y = 2x + 1
- Step 1: Find gradient: m = (13 - 5) / (6 - 2) = 8 / 4 = 2. Step 2. Use point-slope form: y - 5 = 2(x - 2) => y - 5 = 2x - 4 => y = 2x + 1. Answer: y = 2x + 1. Why not the others: Inverting rise and run gives m = 0.5, and confusing y1 with c is an error.
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