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# Reciprocals..... watch

1. For the equation of a line y=2x the equation of a perpendicular line would be y=-0.5x. but what is the equation of a line perpendicular to y=4? does it have a reciprocal because there is not x value?
2. Do you know the equations of any vertical lines?
3. (Original post by bbm100)
For the equation of a line y=2x the equation of a perpendicular line would be y=-0.5x. but what is the equation of a line perpendicular to y=4? does it have a reciprocal because there is not x value?
A line that is perpendicular to the line y=4 is x=a where a stands for any number. This y=4 has zero slope and 1/zero = infinity
4. (Original post by Andythepiano)
A line that is perpendicular to the line y=4 is x=a where a stands for any number. This y=4 has zero slope and 1/zero = infinity
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