Jake earns $12 for each hour worked. The equation y = 12x can be used to model this situation, where x represents the number of hours worked and y represents the total amount earned. what's the independent variable

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?