Fit both regression directions and recover the means

Eight pairs of observations are given below.

$x$	$y$
16	7
13	17
16	12
15	11
16	18
12	10
17	17
15	12

(i) Find the regression line of $y$ on $x$.

(ii) Find the regression line of $x$ on $y$.

(iii) On a scatter diagram, sketch the two regression lines.

Use your answers in (i) and (ii) to find $\bar x$ and $\bar y$.