Abmw car on a truck weighs 20 tons plus 1 ton per cubic yard of x cubic yards of spares that it carries. the total weight of a truck with bmw is: f(x) = x + 20. how will the graph of this function change if the bmw weight is changed to 15 tons? the line will shift vertically up by 5 tons. the line will shift vertically up 15 tons. the line will shift vertically down by 5 tons. the line will shift vertically down by 15 tons.