Given the system of equations, what is the solution? x + 2y = 7

x - 2y = -1

A. {(-4, 6)}
B. {(-8, -12)}
C. {(3, 2)}

What is the greater volume 72 quarts or 23 gallons

What is the average diastolic blood pressure for adults

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?