how do you find a line perpendicular to another if the given line is in standard form, Ax+By=c?

also, i need some help finding a line perpendicular to y=3 and crosses the points (2,4). help plz?

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  1. Your first line can be rewritten
    y = -(A/B)x + C/B
    Its slope is -A/B

    Any line with a slope B/A will be perpendicular to your first line.
    One form would be Bx -Ay = d
    where d is any constant.

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