We are given that cost of 10 cookies = $5.
Let us find the cost of one cookie.
Cost of one cookie = 5/10 = $0.5.
Let us assume number of cookies purchased = x cookies.
And total cost of x number of cookies = y.
Therefore,
Cost of x cookies at the rate $0.5 each cookie = 0.5x
Therefore, cost equation would be
y=0.5x.
For 0 number of cookies there would be 0 cost.
So, first coordinate would be (0,0) and we are given 10 cookies cost = $5.00.
Therefore, second coordinate would be (10,5).
Plotting (0,0) and (10,5) coordinates on the graph and jointing the points to draw a line.
The drawn line represents the proportional relationship.