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Tell whether the graphs of the pair of equation are parallel, perpendiculat or neither

5x + 5y =1
5x-5y =9

5x+5y=1
5y=1-5x
y=(1-5x)/5
y=-x+(1/5)

5x-5y=9
-5y=9-5x
y=(9-5x)/-5
y=x-(9/5)

The slope of the second one is the negative reciprocal of the first so they are perpendicular lines

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