In order to draw a specific line, knowing one point that the line passes through is not enough information. We would know where to draw the line, but it could have any slope.

For example, these lines all go through the point .

If we knew only the slope of a line, we would know how to draw it but the line could be located anywhere. For example, these lines all have a slope of .

To know the exact location of a line, we need either both the slope and the coordinates of one point on the line, or the locations of at least 2 points that are on the line. For example, this line goes through the point and has a slope of . This line could also be described as the line that passes through and .