Find the Best Predicted Value of Y Corresponding to the Given

Multiple Choice

Find the best predicted value of y corresponding to the given value of x.
-Four pairs of data yield $\mathrm { r } = 0.942$ and the regression equation $\mathrm { y } = 3 \mathrm { x }$ . Also, $\overline { \mathrm { y } } = 12.75$ . What is the best predicted value of $y$ for $x = 2.8$ ?

A) $2.826$
B) $0.942$
C) $8.4$
D) $12.75$