I get
|2+9/4|/√(1/16 + 1)
= (17/4)/√(17/4)
= √17/2
To see how, take a look at
http://en.wikipedia.org/wiki/Distance_between_two_straight_lines
find the distance between lines whose equations are: y=-1/4x+2 and y=-1/4x-9/4.
d=�ã(1-(-3)^2 +(1-2)^2
1 answer