Question

The equation for the line of best fit is f(x) ≈ 1.8x − 5.4 for the set of values in the table. Using the equation for the line of best fit, what is a good approximation for x when f(x) = 30? 14 20 45 54

Answer 1

the answer is b i got it right 

Answer 2

1.8x-5.4=30 add 5.4 to both sides

1.8x=35.4 divide both sides by 1.8

x=354/18

x≈19.67

So 20 would be a good approximation for x.