Final answer:
Sal and Lidia's salaries are proportional because they both earn the same hourly rate which is $10 per hour, after dividing their weekly salaries by the number of hours they work.
Step-by-step explanation:
To determine whether Sal and Lidia’s salaries are proportional, we need to compare their respective rates of pay per hour.
To find the hourly wage, we divide the weekly salary by the number of hours worked per week.
For Sal, who earns $400 per week for working 40 hours, the hourly rate is $400 ÷ 40 hours = $10 per hour.
Lidia, who earns $250 per week for working 25 hours, has an hourly rate of $250 ÷ 25 hours = $10 per hour.
Since both Sal and Lidia earn the same amount per hour, their salaries are indeed proportional when considering the hourly wage.