Question

A coal car on a train weighs 30 tons plus 1 ton per cubic yard of coal x that it carries. The total weight of a coal car is: f(x)=x+30. How will the graph of this function change if the coal car weight is changed to 26 tons?

Answer 1

Answer: Then the graph of the function f(x) will change shifting vertically down (because the negative sign in 4) by 4 tons.