alegebra

which two equations represent perpendicular lines:
y= 2x-9
y= 1/2x+9
y= -1/2x+9
y= 1/2-9

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  1. They are all in y = mx + b form.

    m is the slope

    Pick the two with the same slope.

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  2. do you mean two with opposite reciprocals? Because wouldn't two with the same slope be parallel?

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