Which of the following statements best describes the graph of -5x + 2y = 1?
a. It is a straight line joining the points (1, 3), (3, 8), and (-3, -7).
b. It is a curve joining the points (-1, -3), (-1, -3), and (1, 5).
c. It is a curve joining the points (-5, 2), (2, 3), and (4,1).
d. It is a straight line joining the points (4, -3), (-1, 2), and (-4, 5).