Solve the Problem $( 2,37 )$ And $( 6,50 )$ To Write a Linear Model for These Data

Solve the problem.
-A pediatrician records the age x (in yr) and average height y (in inches) for girls between the ages of 2 and 10. a. Use the points $( 2,37 )$ and $( 6,50 )$ to write a linear model for these data.
b. Use the model to forecast the average height of 11 -yr-old girls.

A) a. $y = 3.25 x + 30.5 ;$ b. $67.25$ in.
B) a. $y = 3 x + 29.5 ;$ b. $62.5$ in.
C) a. $y = 3 x + 29.5$ ; b. $63.25$ in.
D) a. $y = 3.25 x + 30.5$ ; b. $66.25 \mathrm { in }$ .