How to solve surface area triangular prisms

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

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?