Description: the set of points above the x-axis in the plane rectangular coordinate system Pay attention to the top, not the top!

Description: the set of points above the x-axis in the plane rectangular coordinate system Pay attention to the top, not the top!

{(x,y)│y>0,x∈R}

The following sets are represented by appropriate methods: (1) in a plane rectangular coordinate system, a set of all points on the x-axis; (2) in a plane rectangular coordinate system, a set of all points on the x-axis
(1) In the plane rectangular coordinate system, a set of all points on the x-axis;
(2) In a rectangular plane coordinate system, a set of all points on the y-axis
(3) In the plane rectangular coordinate system, a set of all points in the second quadrant;
Express the following sets by Description: the set of all integers greater than - 3 and less than 9

1, (x, 0) 2, (0, y) 3, (x > 0, Y > 0) 4, (- 2, - 1,0,1,2,3,4,5,6,7,8)

The set of points on the straight line χ - γ + 2 = 0 in the plane rectangular coordinate system

y=x+2