Given that the point P (m, n) is on the straight line x = - 1, and the point P is symmetrical about the origin of the coordinate is on the straight line y = 3, the coordinate of P is obtained

Given that the point P (m, n) is on the straight line x = - 1, and the point P is symmetrical about the origin of the coordinate is on the straight line y = 3, the coordinate of P is obtained

Point P (m, n) on the line x = - 1
m=-1
The point P symmetric about the origin of the coordinate is (- m, - n) on the line y = 3
So - n = 3
n=-3
So it's (- 1, - 3)

If the points m (m, - 5) and n (3, n) are symmetric about the origin, then 3m-2n =?

m=-3,n=5,3m-2n=-19

If there is a point P (m-5, 2m) on the straight line y = x + 3, then the coordinates of the symmetric point P 'about the origin of point P are______ ．

∵ point P (m-5, 2m) is a point on the straight line y = x + 3, ∵ 2m = m-5 + 3, i.e. M = - 2; then the coordinates of point P are (- 7, - 4), then the coordinates of the symmetric point P 'of point P about the origin are (7,4). So the answer is: (7,4)