The slope of the line which is perpendicular to the line segment joining the points (8, -5) and (-4, 7) is :

1. -1

2. 1

3. 45°

4. -45°

The inclination of a line passing through the points (4, 3) and (5, 4) is :

1. 1

2. -1

3. 45°

4. 60°