?????????? yu want a line tu go thru point=(7, -10) ????????? . . . slope 90 deg tu 4/7 is =-7/4, . . . yer strate line be y=(-7/4)x+konst . . . projekt line from x=7 tu x=0...deltax=-7 . . . deltay=slope*deltax=(-7/4)*(-7)=+49/4 . . . y at x=0...-10+49/4 or (49-40)/4=+9/4 or 2.25 . . . yer line: y=(-7/4)x +2.25