the linear regression equation is:

a$)$ y $=15\mathrm{.}2-1\mathrm{.}675$x

b$)$ y $=15\mathrm{.}2+1\mathrm{.}675$x

c$)$ y $=-15\mathrm{.}2-1\mathrm{.}675$x

d$)$ y $=-15\mathrm{.}2+1\mathrm{.}675$xThe number of ice$-$creams sold by a parlour on days of different temperature is shown in the table below.