Which expression matches the statement "add 5x and 3x, then subtract the so obtained sum from 12y”?
12y - 5x - 3x
"Add 5x and 3x" is algebraically written as 5x+3x.
Now, "subtract the so obtained sum from 12y" is algebraically written as 12y−(5x+3x). i.e., 12y−5x−3x.
Note that 5x and 3x are like terms. Hence the expression becomes 12y−8x.