math
posted by Johnny .
The distance between points A and B is 10 units. If a has coordinates (4,6) and B has coordinates (2,y), determine the value of y.
Please show work and explain.
A.6
B.2
C.0
D.1
E.2
This is what I got so far:
10= square root of (4(2))^2+(6(y))^2

(y+6)^2 + (6)^2 = 100
y^2 + 12 y + 36 + 36 = 100
y^2 + 12 y  28 = 0
(y2)(y+14) = 0
y = 2 or 14
y = 2 is on your list