Final answer:
The appearance of positive slope differs from negative slope and zero slope. Positive slope indicates an upward movement along the line, negative slope indicates a downward movement, zero slope represents a horizontal line, and vertical lines have an infinite slope.
Step-by-step explanation:
When comparing the slopes of a line, we can rank them based on their magnitudes. In terms of appearance, a positive slope indicates that as you move from left to right along the line, the line moves upwards. The steeper the line, the higher the positive slope. On the other hand, a negative slope indicates that as you move from left to right along the line, the line moves downwards. The steeper the line, the lower the negative slope. A slope of zero represents a horizontal line that doesn't change in height. Finally, a vertical line has an infinite slope, meaning it is neither positive nor negative.