A piece of yarn is cut into two parts. If one of the resulting pieces is M inches long, represent the length of the other piece.
M + N = Y
To represent the length of the other piece, we need to find the length of the original yarn before it was cut. Let's call the original length of the yarn L inches.
When the yarn is cut into two parts, one of the resulting pieces is M inches long. This means that the length of the other piece can be found by subtracting M from the original length L.
Therefore, the length of the other piece can be represented as L - M inches.