The signs of the coordinates of a point in the third quadrant are ____________

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 ______________

If a person moves either 1 unit in the direction of positive x-axis or 1 unit in the direction of positive y-axis per step, then the number of steps he requires to reach (10,12) starting from the origin (0,0) is ________

The y-coordinate of the point of intersection of the line y =3x + 4 with x =3 is _______