???????????? "point-slope" ?????? yu hav long pointed nose ??????????
???????????????????????? "passeseseeseeeseesssss thru" ????????????????
a line GO THRU a point
me assume yu want a strate line with slope=2/3 & go thru point=(2,7)
y=(2/3)x +konst
projekt line from x=2 tu x=0...deltax=-2, deltay=slope*deltax=(2/3)*(-2)=-4/3
thus, y at x=0 be 7-4/3 =(21-4)/3 =17/3
y=(2/3)x+17/3