# Find the equation of the line perpendicular to the line y=5 and passing through (5,4)

Find the equation of the line perpendicular to the line y=5 and passing through (5,4)
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Since the graph of y=5 is a horizontal line, any line perpendicular to a horizontal line is a vertical line, whose equation can be written in the form x=a. Since it passes through the point (5,4), so the equation is:
x=5
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