Please help me solve this asnwer

If you are just building your payment history, how many points from a perfect score will you possibly miss?

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?