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1. Since the product of the slope is -1, hence the lines are perpendicular

   Parallel and Perpendicular lines

   Two lines are known to be parallel if they have the same slope while if two lines are perpendicular if the product of the slope is -1

   Given the coordinates of line 1 passing through (0, 6) and (6, 4), the slope is given as;

   Slope = 4-6/6-0
   Slope = -2/6
   Slope = -1/3

   Similarly for the coordinate points (-1, -7) and (1, -1).

   Slope = -1+7/1+1
   Slope of line 2 = 6/2

   Slope = 3

   Take the product of the slopes

   Slope = -1/3 * 3
   slope = -1

   Since the product of the slope is -1, hence the lines are perpendicular

   Learn more on parallel and perpendicular lines here: https://brainly.com/question/25429151

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