Write an equation for the line that passes through (3,5) and (3,9). is the line parallel or perpendicular to the x-axis? what is the slope of the line?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )