which system of equations has infinitely many solutions?
a)6x + 3y = 12
3x + y = 9
b)2x + 3y = 6
4x + y = 8
c)12x +9y = 6
4x + 3y = 6
d)5x + 10y = 20
2x+4y=8

An observer(o) spots a plane(p) taking off from a local airport and flying at a 29 degree angle horizontal to her line of sight and located directly above a tower(t). the observer also notices a bird circling directly above her. if the distance from the plane(p) to the tower(t) is 6,000ft., how far is the bird(b) from the plane(p).