The equation y=2x+3 represents the cost y (in dollars) of mailing a package that weighs x pounds.

a. Graph the equation

b. Use the graph to estimate how much it costs to mail the package

c. Use the equation to find how much it costs to mail the package

the equation that represents the cost is a lineal and it is, as you can see, it is a function with positive slope, it means that as the pounds are heavier, the shipping cost will be higher, the shipping cost is from three dollars onwards, as you can see in the graph, as there are no negative weights, the values of x are taken to from zero onwards