Answer:
y = 28x + 112, 21 days
Step-by-step explanation:
y = 700
28x where x is the number of days it will take, plus the 112 pages she has already read
y= 28x + 112
700 = 28x +112
588 = 28x
x = 21
It will take the editor 21 days to proofread the manuscript