Of course, it is wrong. As the title means, the resulting figure should be a triangle, but 0.

0<= y<= 1 The resulting graph is a square.

As for how to express it, I find it difficult. An area should be accurately expressed in only one way ~ of course, this is just my idea. After all, I just finished the college entrance examination, and you are taking the postgraduate entrance examination ~ Hehe, think again ~