When a rectangular grassland is reduced by 5 m in length and increased by 3 m in width, a square grassland is obtained. The area of this square is equal to that of the original rectangle, Find the area of the original rectangle Let the length be x and the width be y The equations 3 (X-5) = 5Y (1) are given x-5=y+3② I want to ask: How did you get it?

When a rectangular grassland is reduced by 5 m in length and increased by 3 m in width, a square grassland is obtained. The area of this square is equal to that of the original rectangle, Find the area of the original rectangle Let the length be x and the width be y The equations 3 (X-5) = 5Y (1) are given x-5=y+3② I want to ask: How did you get it?

① Equation 3 (X-5) is the reduced area in the length direction; 5Y is the increased area in the width direction. Because the total area is equal, the reduced area in the length direction is equal to the increased area in the width direction
We can also use the following formula:
(x-5)(y+3)=xy