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)

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(-1,9) and (-6,-6) : slope =3 (-7,-23) and (0,-2): slope=3 same slope means lines are parallel

how did you figure that out with out graphing?

there is a formula to find the slope of line with 2 points given....

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