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Slope of the line perpendicular to y = mx + c

The same question, asked 2 times: 14 Sep 2025 S3*, 15 Sep 2025 S3. Every wording below, oldest first.

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  1. Question 1

    14 Sep 2025 S3

    67
    Find the slope of the line perpendicular to y=14x+7y = \frac{1}{4}x + 7

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  2. Question 2

    15 Sep 2025 S3

    73
    What is the slope of line perpendicular to y=−3x+7y = -3x + 7?

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