Answer:
To plot -1 7/8 on a number line, first, find the whole number that -1 7/8 is closest to. Since -2 is the next whole number less than -1 7/8, you can plot -2 on the number line.
Next, divide the space between -2 and -3 into eighths (since there are 8 parts to the fraction 7/8), and mark off seven of those parts (since the numerator is 7). The eighth part will be the endpoint of the fraction 7/8.
So, the point that represents -1 7/8 on the number line will be to the right of -2, seven-eighths of the way towards -1:
```
| x
|------------------------
-3 -2 -1
```
The x represents the point that represents the mixed number -1 7/8 on the number line.