Question

Which of the following statements is​ correct? A. The relationship between two variables is linear whether it is represented by a straight line or by a curved line. B. The relationship between two variables is nonlinear whether it is represented by a straight line or by a curved line. C. The relationship between two variables is linear when it is represented by a straight line and nonlinear when it is represented by a curved line. D. The relationship between two variables is linear when it is represented by a curved line and nonlinear when it is represented by a straight line.

Answer 1

C. The relationship between two variables is linear when it is represented by a straight line and nonlinear when it is represented by a curved line.

Explanation:

The definition of "linear" is "related by a straight line". The definition of "non-linear" is "not related by a straight line." One simply needs to understand the definitions in order to choose the correct statement.