I know why this is wrong, they are asking for the equation. But, can
be seen as "coefficients"?
Since when can

and

ever be considered coefficients when talking about a regression line? And

will be the same as

because that's what the gradient is. Although I don't know where you got

from as your calculator doesn't refer to the gradient as

?
when they ask for "coefficients" do you automatically assume it's the regression equation? or
and
?
I don't get how you are interpreting it like this... In the question it asks you to determine the "least squares regression line", so it is that exact phrase that makes you automatically assume they want the regression equation.
And seen as they are not referring to strength or the relationship (in terms of whether the variation in DP depends on the IV) then why would you ever consider mentioning the

and

values?