Hi,

  5x=6   0r  x = 6/5   Vertical Line (Blue)

 -5y=10  0r   y = -2   Horizontal Line (Green)

Are they perpendicular?  yes



 

Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
 The first x never changes so it is a vertical (up and down) line

The second y never changes so it is a horizontal (across)  line

They are perpendicular.

See my lesson

http://www.algebra.com/my/Linear-equations-and-slopes%3ASpecial-Cases-Part-I.lesson?content_action=show_dev 

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