Answer true or false. (X'OX ; Y'OY)is an orthocenter system.
1) The abscissa of a point is always a positive number.
2)The ordinate of a point is decimal number.
3)The point A(5 ; 0) is a situated on the Y'OY axis.
4)The coordinates of the origin O of the system are (0 ; 0).
5)The point E (2 ; 3) and F (3 ; 2) are coincident.
6)The point on X'OX has its abscissa equal to zero.
7)The point F (0 ; 3) belong to Y'OY.
8)The point H ( _1 ; 2) is in the second quadrant.
9)Given the point R (2 ; 3) and T (2 ; _5) The line (RT) is parallel to X'OX.
10)If J is the orthogonal projection on X'OX of a point I of the plane, then (IJ) is parallel to Y'OY.