+231 Three people are standing on a Cartesian coordinate plane. Robert is standing at point (4,3), Lucy at point (6,1), and Liz at point (1,7). How many units away is the farther person from Robert?
+36916 Find the distance from Robert (4,3) to EACH of the other points using the distance formula
distance = sqrt ((x1-x2)^2 + (y1-y2)^2 )
let x1, y1 be Robert (4,3) and x2, y2 be Lucy (6,1)
then distance = sqrt (( 4-6)^2 + (3-1)^2 ) =
sqrt ( 4 + 4) = sqrt 8
Now let x2 y2 be Liz ( 1,7)
distance = sqrt ( ( 4-1)^2 + (3-7)^2 )
= sqrt (9 + 16) = sqrt 25
Now which is farther from Robert? 
