????????????????? "passeseeseeseesee thru" ???????????
a line GO THRU points...2 points=(1,2) & (5,3)
deltax=4, deltay=1, slope=deltay/deltax=1/4
equashun: y=0.25x +konst
projekt line from x=1 tu x=0...deltax=-1, deltay=slope*deltax=0.25*(-1)=-0.25
y=2-0.25=1.75
equashun: y=0.25x+1.75