Final answer:
The system has infinitely many solutions.
Step-by-step explanation:
To solve the system of equations 3x - 7y = -24 and 3x - 7y = -18, we can see that both equations have the same coefficients for x and y. This means that the two equations represent the same line, and therefore they are equivalent.
Since the two lines are the same, they intersect at every point and have infinitely many solutions.
Therefore, the statement (b) The system has infinitely many solutions is true.