9514 1404 393
Answer:
 10
Step-by-step explanation:
The total earnings for X visits by plumber X and Y hours worked by plumber Y is ...
 41X +46Y = total earnings
 41X +46(7) = 732 . . . . . for the given values
 41X = 410 . . . . . . . . . . . subtract 322
 X = 10 . . . . . . . . . . . . . . divide by 41
Plumber X made 10 visits.