SOLUTION: p= -(1,2) r= (2,4) what is the slope of pr? what is the slop of the line perpendicular to pr? pr=? please help!

Question 827745: p= -(1,2)
r= (2,4)
what is the slope of pr?
what is the slop of the line perpendicular to pr?
pr=?

please help!
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
What is this? p= -(1,2)
Do you mean this: p=(-1,-2) ?

Assuming so, slope is vertical change divided by horizontal change.
Let this slope be m.

Let = the slope for a line perpendicular to the line of slope m.

Find .
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