Y = 2x 4 4 y=-1-2
X: Function
O: Non-Function
X: Function
O: Non Function
Punexion
O: Non Function
y = 54
1
y=+*+ 3
X: Function
O: Non-Function
X: Function
O: Non Function
y Function
O Norbunction
x + y2 = 2
x+2y=8
X: Function
O: NorrFunction
: Function
O: Non-Function
: Function
O: NonFunction

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?