The line of best fit through a set of data

Question

The line of best fit through a set of data is

y=43.867−2.669x

According to this equation, what is the predicted value of the dependent variable when the independent variable has value 70?

Round to 1 decimal place.

y =______________

Answer 1

y=43.867−2.669x

x = 70

y=43.867−2.669 (70)

= -142.963

Answer 2

substitute 70 for x in the equation then compute y.