A freight airline charges a flat fee to airmil a box, plus an additional charge for each pound the box weights. The graph above shows the relationship between the weitht of the box and the total cost to airmail it. Based on the graph, how much would it cost in dollars to airmail a 40-pound box

Answer

70

Explanation

Because 40 poinds is not shown on the graph, you nees more information. Ln a real-world scenario, the y-intercept of a graph usually represents a flat fee or a satarting amount. The slope of the line represents a unit rate, such as the cost per poind to airmail the box.
Thte y-intercept of the graph is 10, so the flat fee is `$10.` To find the cost per pound (the unit rate), substitute two points from the graph into the slope formula. Using the points `(0,10) and (4,16),` the cost per pound is `(16-10)/(4-0) =6/4=1.5,` which means it costs `$1.50` per pound to airmail a box. The total cost to airmil a 40-poind box is `$10+1.50 (40) =$10+$60=$70.` Gird in 70.