Question 910303
x=6 is a VERTICAL Line, x = -2 is parallel to it.
see Blue Lines Below
{{{drawing(300,300,   -10,10,-10,10,  blue(line(-2,10,-2,-10)), blue(line(6,10,6,-10)),   
 grid(1),
graph( 300, 300, -10,10,-10,10))}}}