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## Sagot :

to each other.

So there's no line that's perpendicular to both of them, and you're asking

two separate questions.

__For both of them, you have to remember this:__

*Lines that are perpendicular have negative reciprocal slopes.*

-- The slope of [ y = x - 1 ] is 1, and the negative reciprocal of 1 is -1/1 = -1 .

A line perpendicular to [ y = x - 1 ] is [ y = -x + any number ].

-- The slope of [ y = -1/3 x - 1 ] is -1/3, and the negative reciprocal of -1/3 is 3 .

A line perpendicular to [ y = -1/3 x - 1 ] is [ y = 3x + any number ].