Hello my frands fr poi

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

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?

Answer pls man im trying to get out of summer school