Asked by amber

find y so that the distance between the points is 8:

(0,0) (3,y)
Answered by bobpursley
using the distance formula..

8=sqrt (3^2 + y^2)
square bot sides.
64=9+y^2
subtract 9 from both sides
55=y^2
y=sqrt 55
Answered by Pythagoras
The distance formula is just the pythagorean theorem(x^2+y^2=hypotenuse^2). If you know x (0+3=3) and you know the hypotenuse (8), you can find y.

3^2 + y^2 = 8^2
9 + y^2 = 64
y^2 = 55
y = sqrt(55)
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