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A perpendicular line has the opposite reciprocal slope. The opposite reciprocal of 7 is -1/7, so any line with a slope of -1/7 would be perpendicular to y=7x-4.
y = -x/4
Slope of a line perpendicular to x-y=16
The slopes of perpendicular lines are negative reciprocals.[ y = -3x + 2 ] is perpendicular to [ y = x/3 plus any number ].
Neither perpendicular nor parallel
Parallel. They both have a slope of 4.