Explanation:
We can see that the points form a line which slope is 3, because for each unit we move to the right horizontally we move 3 units up.
Since the first point is located at (1, 3) we can see that if we had one more point 1 unit to the left (x = 0) it'd be 3 unit lower than this point (y = 0). Therefore the line goes through the origin (0, 0). This means that the relation is directly proportional, because the y-intercept is 0.
Answer:
The correct option is A. directly proportional and related by y = 3x
