Scripty mathy stuff

[Yen]

My head hurts.
Someone help me with this, or even work it out for me. ;-;

verticalspeed = sin(zangle)*s
verticalspeed -= .1 every .05 seconds
horizontalspeed = cos(zangle)*s
x = x + cos(angle)*horizontalspeed
y = y - sin(angle)*horizontalspeed
z = z + verticalspeed

zangle = -pi/10
initial z = 8
initial x = 0
initial y = 0

I need it so when z = 0, x,y = finalx,finaly
z = 0, x = finalx, y = finaly

;-; Help.