Final answer:
Without the cost per line of the Daily Times, we cannot compare it to the cost per line of the Greenville Journal (which is $2 per line). Thus, we have insufficient information to determine which newspaper charges less per line.
Step-by-step explanation:
The question asks which newspaper charges less per line for an advertisement. We have the equation for the Greenville Journal, y = 2r + 20, where y is the total cost in dollars and r is the number of lines. This equation suggests that the Greenville Journal charges a $20 fee, plus $2 per line. To determine which newspaper charges less per line, we would need the cost per line for the Daily Times as well, which is not provided. Therefore, without additional information, we cannot compare the per line charge between the Daily Times and the Greenville Journal, making option D (Insufficient information to determine) the correct choice.