For a)
When the flour in the machine reaches 0 grams, we can know the time because it is represented by the x-intercept, in this case, is 5 minutes.
The point in red
For b)
As we can see we have a line with a negative, so we need to calculate the slope in order to know the rate.
We can use the next formula
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
we can use the next points
(0,700)=(x1,y1)
(5,0)=(x2,y2)
[tex]m=\frac{0-700}{5-0}=\frac{-700}{5}=-140[/tex]
therefore the solution is
As time increases, the amount of flour in the machine decreases.
At what rate is the amount of flour decreasing?
140 grams per minute
