Please give me the correct answer. I'm trying to ask a tutor for help but it says tutor is currently not available. ​

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?