First, let's write the ordered pairs using the numbers we are given. The first number, 281000, represents the weight of the box as one item is taken out of it. Thus, the ordered pair is (1,281000). We can write the rest of them in a similar manner.
Let's now use the slope-intercept form of the equation to write the function.
We can calculate the slope m by substituting two arbitrary points from above into the Slope Formula. Let's use (1,281000) and (2,270000).
We know the weights of the box after taking out each item. Hence, if we calculate the differences between consecutive weights, we will know the weight of each item.
The weight of each yearbook is 11000 ounces.
It is given that the weight of the box when full is 292000 ounces, and when it's empty is 17000 ounces. Therefore, by subtracting 17000 from 292000 we can calculate the weight of all of the items, not including the weight of the box.
Now if we divide this weight by the weight of 1 book, we will know how many items were in the box.
There were 25 items in the box.