For this case, the first thing we must do is define a variable.
We have then:
x: every 50 pounds transported
y: total cost
We now write the equation that models the problem:

Where,
100: slope of the line representing 100 $ for each 50 pounds transported
1200: cutting point with the axis y that represents a cost to rent the truck
Answer:
An equation that represents the transport cost for every 50 pounds of cold cuts transported is:
