In fact, this answer is correct, except that "∴ profit 18 yuan" is at the end.

After solving, x+y is the total purchase price of 288.

Then 135 * 2 = 270 is the selling price.

Volkswagen clothing store bought 288, but only sold 270, so it lost 18.

If your teacher asks to solve problems with equations, use this (but change it).