Consider the following data : Year 2012 2013 2014 2015 2016 Sales (in ₹ crores ) 9 18 21 29 38 A straight line trend by the method of least square is :

$y= 21.5 + 5.45 x$ $y =6.9+23x$ $y=24+7.3x$ $y=23+6.9x$

$y=23+6.9x$