Which of the following represents a Linear function?

A. y= 3x²+2
B. y= 2x²-7
C. y= 2x+2
D. y= 3x³-7

C

Step-by-step explanation:

any function of first degree represents a linear function.

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.