Ihave a right triangle they need an equation from me.the truangle is x,4,7 i need

A) Find where the line on the graph crosses the X and Y values and divide the Y value ( price of corn) by the X value ( number of bushels)

price = 24, number of bushels =3

24/3 = 8 dollars per bushel.

B) Previous year: 3 bushels cost 21 dollars:

21 /3 = 7 dollars per bushel.

8 - 7 = $1 more than the previous year.