David is walking. The number of calories he has burned varies directly with the number of minutes he has walked. See the graph below.

Question

anonymous · Answer

attachment

anonymous · Answer

how many calories is david burning per minute
what is the slope of the graph

anonymous · Answer

@ganeshie8

anonymous · Answer

$$(80-0)\div (20-0) = slope $$
$$slope =4$$
the slope is 4, meaning david burns 4 calories per minute.

anonymous · Answer

let m = the slope of the graph
$$m=(y2-y1)/(x2-x1)$$

from the graph 
$$m=(60-20)/(15-5)$$
$$m=40/10$$
$$m=4$$
$$y=mx$$
the slope is 4 calories per minute
when x = 1 minute
$$y=4*1$$
$$y = 4$$
David is burning 4 calories per minute

anonymous · Answer

@fatZak  to me that is perfect explanation!

anonymous · Answer

probably the only thing you did not do was interpret your result!

anonymous · Answer

Look at the question again @fatZak

anonymous · Answer

but other than that @fatZak its 100%