I accidentally deleted your post. Sorry.
a 10 foot board is cut into two pieces.
If one peace measures x, write an expression for the lenght of the other piece
10 - x = y
L = 10-X.
Your Eq is correct.
No problem! It happens.
To find the expression for the length of the other piece, let's consider the total length of the board (10 feet) and the length of one piece (x).
Since the board was cut into two pieces, the length of the other piece can be found by subtracting the length of the first piece (x) from the total length of the board (10 feet).
Using the subtraction operation, we can write the expression as:
10 - x = y
In this expression, y represents the length of the other piece.