Answer:
The repairman worked for 5 hours
Step-by-step explanation:
use the given information to write an equation in slope intercept form (y=mx+b):
y = 75x + 100
Mr. Billings paid $475, so y = 475:
475 = 75x + 100
solve:
75x = 375
x = 5
The repairman worked for 5 hours
