X : the gas used by first car in 1 particular week
y : the gas used by second car in 1 particular week

Answer:
3 dollars
Step-by-step explanation:
Answer: x=3
Step-by-step explanation:
To solve this problem you must apply the proccedure shown below:
- Multiply both sides of the equation by 3:

- Now you must make the equation equal to zero as following:

- Factor it, as you can see below. Therefore, you obtain the following result:
