Answer
-8/7 $ \lt $ -3/7
Work Step by Step
The basic idea behind comparing two numbers a and b on the real number line is that if a lies to the left of b then a < b. If we plot -3/7 and -8/7 on the real number line -8/7 lies to the left of -3/7. Thus:
-8/7 $ \lt $ -3/7