Which set of ordered pairs X Y could represent a linear function of x

A (-2,8) (0,4) (2,3) (4,2)

B (1,2) (1,3) (1,4) (1,5)

C (-2,7) (0,12) (2,17) (4,22)

D (3,5) (4,7) (3,9) (5,11)

A and C.

Step-by-step explanation:

A function is defined as a relation between input values and output values. The set containing input values is called domain, and the set containing output values is called range.

The most important characteristic of functions (which define them) is that an input value can't have two difference output values. Having said that, notice that sets B and D have pairs that don't follow this rule.

Therefore, the right answers are A and C, because each input value has only one output value.