Answer: C. The relationship is not linear.
Step-by-step explanation:
When the rate of change is constant of one variable is corresponding to the change in the other variable , then the relationship is said to be linear.
The rate of change is given by:-
[tex]R=\frac{\text{change in y}}{\text{change in x}}\\\Rightarrow\ R=\frac{2-1}{7-3}=\frac{1}{4}[/tex]
Also,
[tex]\\\Rightarrow\ R=\frac{5-3}{18-11}=\frac{2}{7}[/tex]
[tex]But\ \frac{1}{4}\neq\frac{2}{7}[/tex]
Therefore, the rate of change is not constant .
Hence, The relationship is not linear.
