Javier is comparing costs of two cars. car a costs $130 per month for insurance and $0.10 per mile to run. car b costs $108 per month for insurance and $0.15 per mile to run. he defines x as the number of miles driven each month and y as the total cost to run the car. which set of equations can be used to find the number of miles javier would need to drive to make the costs equal? answer choices down