An x +4 x+4

B y -8 y-8

Reciprocal relationship: (1) Two pools * * * store 40 tons of water; (2) A injects 4 tons of water and B releases 8 tons of water, so the water in the two pools is just equal.

Solution: In the past, there were x tons and y tons of water in Pool A and Pool B respectively.

According to the meaning of the question, you must

x+y=40

x+4=y-8

solve

x= 14

y=26

A: Pool A and Pool B have 65,438+04 tons and 26 tons of water respectively.

The application of binary linear equations. Find two equivalent relationships and you can solve them!

I hope it will inspire you!