anonymous
  • anonymous
How can u tell whether these lines are parallel or perpendicular or neither with out graphing? line 1; through (-1,9) and (-6,-6) line 2; through (-7,-23) and (0,-2)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
(-1,9) and (-6,-6) : slope =3 (-7,-23) and (0,-2): slope=3 same slope means lines are parallel
anonymous
  • anonymous
how did you figure that out with out graphing?
hartnn
  • hartnn
there is a formula to find the slope of line with 2 points given....

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radar
  • radar
They calculated the slope of each line using \[\Delta y \over \Delta x\] When the slopes are equal to each other (in this case they were both 3) they are parallel. If they were negative reciprocals like one was 3 and the other -1/3. then they would of been perpendicular.
hartnn
  • hartnn
for perpendicular,slopes must be negative inverse
anonymous
  • anonymous
@radar I used that method....sorry for nothing showing my work.
anonymous
  • anonymous
ohhhh. okay i got it. and its okay @RyanL.
radar
  • radar
@RyanL, good work, I was just trying to assist. I want to explain what a negative reciprocal is, because by the questions being submitted he is going to need to understand that too.
anonymous
  • anonymous
**She
radar
  • radar
One number is a negative reciprocal of another number if their product is -1.
radar
  • radar
Sorry "she".
anonymous
  • anonymous
its alright.. and okay thanks.. again. lol

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