Question 1180723


a line which is parallel to {{{x=0}}} (vertical line at zero is x-axis)


c. {{{x=4}}}->vertical line

{{{ drawing ( 600, 600, -10, 10, -10, 10,
green(line(0.1,10,0.1,-10)),blue(line(4,10,4,-10)),
graph( 600, 600, -10, 10, -10, 10, 0)) }}}