strate line thru point=(6,3)
& 90 deg tu 5x-2y=3...2y=5x-3, or y=(5/2)x & sumthun
its slope=5/2, so we need line with slope=-2/5=-0.4
y=-0.4+konst
projekt line from x=6 tu x=0, deltax=-6
deltay=slope*deltax=(-0.4) *(-6)=+2.4
y-intersept=3+2.4=5.4
y=-0.4+5.4