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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....

for perpendicular,slopes must be negative inverse

**She

One number is a negative reciprocal of another number if their product is -1.

Sorry "she".

its alright.. and okay thanks.. again. lol