Line l is defined by the equation y = 3x + 10. If lines l and k intersect to form a right angle at the point (3,4), which of the following is the equation of line k?

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Line <em>l</em> is defined by the equation <em>y</em> = 3<em>x</em> + 10. If lines <em>l</em> and <em>k</em> intersect to form a right angle at the point (3,4), which of the following is the equation of line <em>k</em>?