Solution:

Magnetic bearing and True bearing

- Magnetic Bearing: It is the angle between the magnetic north and the line. In this case, the magnetic bearing of the line is N 88 E.
- True Bearing: It is the angle between the true north and the line. In this case, the true bearing of the line is S 89 E.

Calculation of Magnetic Declination

- Magnetic declination is the angle between the magnetic north and the true north at a particular location.
- To calculate magnetic declination, we need to subtract the true bearing from the magnetic bearing.
- In this case, the magnetic bearing is N 88 E, and the true bearing is S 89 E.
- We can convert the true bearing to magnetic bearing by adding 180 degrees to it. So, the magnetic bearing is N 91 E.
- Now, we can subtract the true bearing from the magnetic bearing to get the magnetic declination.
- Magnetic Declination = Magnetic Bearing - True Bearing
- Magnetic Declination = N 91 E - S 89 E
- Magnetic Declination = 180 + 91 - 89
- Magnetic Declination = 182 - 89
- Magnetic Declination = N 93 E

Conclusion:

The magnetic declination is N 93 E. This means that the magnetic north is 93 degrees east of the true north at the location where the line is situated.