thru point=(-3,2)
90 deg tu line x+2y=7....y=-0.5x +3.5
this line hav slope=-0.5
perpendikular line slope=-1/(this slope)=+2
so, make line with slope=2 thru point=(-3,2)
projekt line from x=-3 tu x=0
deltax=+3
deltay=slope*deltax=2*3=6
y=2+8=8
this point is(0,8)
y=2x+8