Is It a Function?

Relation:{(2,3),(2,4),(3,5)} Is it a function?

• YES

• NO

Relation:{(x,y)|x is a real number and y=2x+1} Is it a function?

• YES

• NO

Relation:{(1,2),(3,4),(5,6),(1,7)} Is it a function?

• YES

• NO

Relation:{(x,y)|y is a real number and x=y^2} Is it a function?

• YES

• NO

Relation:{(a,b)|a is a person's name and b is their birth month} Is it a function?

• YES

• NO

Relation:{(x,y)|x is the number of petals on a flower and y is the color of the flower} Is it a function?

• YES

• NO

Relation:{(x,x^2)|x is a real number} Is it a function?

• YES

• NO

Relation:{(x,y)|x is the temperature in degrees Celsius and y is the temperature in degrees Fahrenheit} Is it a function?

• YES

• NO

Relation:{(3,4),(5,6),(3,7),(8,9)} Is it a function?

• YES

• NO

Relation:{(x,y)|x is a student's ID number and y is their grade in mathematics} Is it a function?

• YES

• NO