Determine whether the line through the first pair of points is parallel to, perpendicular to, or neither parallel nor perpendicular to the line through the second pair of points.
a. (1,3) and (-1,-1)
(2,1) and (3,3)
b. (3,1) and (6,3)
(2,-1) and (4,-4)
c. (1,7) and (-1,-1)
(1,1) and (-1,9)
a. (1,3) and (-1,-1)
(2,1) and (3,3)
b. (3,1) and (6,3)
(2,-1) and (4,-4)
c. (1,7) and (-1,-1)
(1,1) and (-1,9)
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Determine whether the line through the first pair of points is parallel to, perpendicular to, or neither parallel nor perpendicular to the line through the second pair of points.
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Solution : Let
be the slope of the line through 
and 
and 
be the slope of the line through 
and 
Then
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Solution :
Line through
and 
slope 
Line through
and 
slope 
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Solution :
Line through
and 
slope 
Line through
and 
slope 
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