Which of the following statements best describes the graph of x + y = 5? (4 points)
1. it is a line joining the points whose x and y-coordinates add up to 10.
2. it is a line joining the points whose x and y-coordinates add up to 5.
3. it is a line which intersects the x-axis at (5, 5).
4. it is a line which intersects the y-axis at (5, 5).
explain why/