Prove that the lines `x+3y+2=0` and `3x-y=0` are perpendicular.

The lines 3x+4y+7=0 and 4x+3y+5=0 are perpendicular.

Prove that 2x + 3y - 6 =0 and 3x - 2y - 1 = 0 are perpendicular

If the straight lines 2x+ 3y -3=0 and x+ky +7 =0 are perpendicular, then the value of k is

If the straight lines 2x+ 3y -3=0 and x+ky +7 =0 are perpendicular, then the value of k is

The equation of the line passing through the point of intersection of the lines x-3y+2=0 and 2x+5y-7=0 and perpendicular to the line 3x+2y+5=0 is

Show that the straight line x-2y+3=0 and 6x+3y+8=0 are perpendicular .