researchers measured the percent body fat and preferred amount of salt (pecernty weight/ volume) for several children. here are data for seven children:

Preferred amount of salt X 0.2 0.3. 0.4 0.5 0.6 0.81.1

Percent body fat Y. 20 30 22 30 38 23 30

what is the equation of the least-squares regression line for predicting percent body fat from preferred amount of salt?

(y hat) a) y= 24.2+6.0x

b) y= 0.15+0.01x

c) y= 6.0+24.2x

I know the answer is A but I need an explanation of how ?