If a straight-line pass through (0,0) and (1,5), then its equation is __________

The point (4,0) lie on the line __________

The point (−5,4) lie in __________

If a point P has coordinates (3,4) in a coordinate system X ′OX ↔ Y′OY, and if O has coordinates (4,3) in another system X₁′O₁X₁↔ Y₁′O₁Y₁ with X ′OX || X ′O₁X₁, then the coordinates of P in the new system X₁′O₁X₁↔ Y₁′O₁Y₁ is ______

The coordinates of a point P in a system X ′OX ↔ Y ′OY are (5,8). The coordinates of the same point in the system Y ′OY ↔ XOX′ are ______________