To raise funds for uniforms and travel expenses, the softball team is having a car wash. The team spend $125 on supplies for the car wash. They plan to charge $15 per car and $25 per truck. Their goal is to raise $850. a) Write an equation to represent this situation, where x represents the number of cars and y represents the number of trucks. b)How many trucks must they wash if they wash 30 cars? c) Solve the original equation for y.