posted by Eric .
In a coordinate plane, the points (2,4) and (3,-1) are on a line.
Which of the following must be true?
1. The line crosses the x-axis.
2. The line passes through (0, 0).
3. The line stays above the x-axis at all times.
4. The line rises from the lower left to the upper right.
5. The line is parallel to the y-axis.
Since the y of the first point is above the x-axis and the y of the second point is below, the line must surely cross the x-axis