????????????? "passing thru" ??????????
a line GO THRU 2 points
(1,5) (3,-4)
deltax=3-1=2
deltay=-4 -5=-9
slope=deltay / deltax =2/-9 =-2/9
y=-2/9x +konst
projekt line from x=1 tu x=0...this deltax=-1
deltay=slope*deltax=(-2/9)*(-1)=+2/9 or 0.222222222222222
nu y=5+0.222222 =5.22222
y=-(2/9)y +5.2222222