Talk:Geometry for Elementary School/Rectangular coordinate system

I am having a hard time understanding this page because there seem to be so many errors. I don't feel confident enough to just correct them myself, so I will list them here. These problems are beyond my ability to fix.
 * 1) 300px-Cartesian_plane.svg.png labels the negative X axis incorrectly. The -1 label should be -2, the -2 label should be -3, and so on. Point P(-1, -2) is drawn at (-2, -2), although it agrees with the x axis label. The X and Y labels pointed to by the Y and X axis rays (arrows) should be labeled Y and X, respectively to indicate increasing positive Y and X.
 * 2) The statement "For example, if P (3, 4) is on the same vertical line as Q (3, y), then y = 4." seems incorrect. Points on the same vertical line have the same x values, as do P and Q, but you cannot say anything about Q's y value. The example should read "For example, if P (3, 4) is on the same vertical line as Q (x, 2), then x = 3."
 * 3) in Cartesian_plane_problem.svg, points P and Q are drawn switched.
 * 4) When I saw the page, the \begin \end and bracketed formatting codes were not working, displaying in bright red text "Failed to parse(unknown function '\begin')" and so on.