strate line thru 2 pointe: (-2,4) & (8,8)
deltax=10, deltay=4
slope=deltay/deltax=4/10=0.4
perpendikular line hav slope=-1/0.4....-2.5
perp line...y=-2.5x+sumthun
want it tu go thru (3,4)...projekt this line tu x=3
deltax=-3, deltay=-3*(-2.5)=7.5
so at x=0, need y=4+7.5=11.5
y=-2.5x+11.5