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    Question

    The distance between (4, –1) and (–8, y) is 13. Find

    possible values of y.
    A y = 4 or y = –6 Correct Answer Incorrect Answer
    B y = 2 or y = 5 Correct Answer Incorrect Answer
    C y = 4 or y = –4 Correct Answer Incorrect Answer
    D y = 4 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Distance formula: (4 + 8)² + (–1 – y)² = 169 12² + (–1 – y)² = 169 144 + (y + 1)² = 169 (y + 1)² = 25 y + 1 = ±5 y = 4 or –6 Answer: y = 4 or y = –6

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