What is the y intercept of the line?

  (0, -23)

Step-by-step explanation:

From x=-72 to x=-36 is an increase in the x-value of 36. At the same time, the y-value decreases by 24 from 25 to 1.

At the same rates of change, when x increases by 36 from -36 to 0, y will decrease by 24 from 1 to -23. That is the point (0, -23) is on this line. Those coordinates are the coordinates of the y-intercept, the point on the line where x=0.

this is answer of 144 cubic meters