SOLUTION: Tell whether the graphs of the following pair of equations are parallel, perpendicular, or neither. y=9-13, y=1/9x+28

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Question 1107278: Tell whether the graphs of the following pair of equations are parallel, perpendicular, or neither.
y=9-13, y=1/9x+28
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
Something missing...

system%28y=9x-13%2Cy=%281%2F9%29x%2B28%29

What do you know about parallel and perpendicular lines and their equations?

Look at product of their slopes:
9%2A%281%2F9%29=1

Does that tell you something?