Final answer:
The lines 9-12 in Robert Frost's 'The Road Not Taken' reveal that both paths were equally untraveled, which adds to the poem's theme of the intricate nature of choices and life's uncertainty.
Step-by-step explanation:
The lines in question, lines 9-12 of Robert Frost's The Road Not Taken, affect the meaning of the poem by indicating that the two roads the speaker encounters are, in fact, equally untraveled, casting doubt on the common interpretation that the speaker chooses a path less taken by others. The lines read: "And both that morning equally lay In leaves no step had trodden black. Oh, I kept the first for another day! Yet knowing how way leads to way, I doubted if I should ever come back." This revelation underscores the poem's theme about the complexity of choice and the unpredictability of life, regardless of the paths we take.