The solution of the linear equation is as follows: Assume that each train car is loaded with x tons on average, and each car is loaded with (440-8X)/ 10 tons on average according to the meaning of the question.

Equation 520 = (8+2) x+(10-5) [(440-8x)/10] can be obtained from the second shipment.

Solve this equation X=50.

Then the average load of each vehicle is (440-8X)/ 10=4 tons.

The solution of the binary linear equation is as follows: Assume that each train car is loaded with X tons on average and Y tons on average.

8X+ 10Y=440

(8+2)X+( 10-5)Y=520

X=50, Y=4 to solve the equation.