Calculate jolene's unit rate in dollars per pound of grain.

The Jolene's unit rate in dollars per pound of grain is 0.25.

Explanation:

It is given that the Jolene is making a line graph that represents the price of grain and the number of pound purchase.

The number of pounds are shown on x-axis and the price in dollar are shown  on y-axis.

The cost of 1 pound is 0.25, therefore the point (1,0.25) lies on the line.

The cost of 4 pound is 1, therefore the point (4,1) lies on the line.

The unit rate in dollars per pound of grain is the the slope of the line.

The slope of a line is,

Therefore, Jolene's unit rate in dollars per pound of grain is 0.25.